Below is a publication-ready grammar guide for Catchy News World, written in simple, internationally understandable English. It includes 100 original examples, grammar explanations, exercises, answer keys, SEO metadata, social media content, and a printable PDF worksheet.
Do Does Did Auxiliary Verb Exercises: 100 Examples
Are you confused about when to use do, does, and did in English? These three small words can make a big difference in your sentences. Our do does did auxiliary verb exercises guide explains the rules with simple examples, practical worksheets, and answers to help students, ESL learners, job seekers, and competitive exam aspirants improve their grammar.
Whether you are asking a question, making a negative statement, writing a professional email, or preparing for an examination, understanding these helping verbs makes English easier.
And here’s some good news: English grammar may have plenty of rules, but these three words are much friendlier once you know their jobs!
What Are Do, Does, and Did in English Grammar?
Do, does, and did are forms of the verb do. They can function as auxiliary verbs, also called helping verbs, or as main verbs.
As auxiliary verbs, they help form questions, negative sentences, and emphatic statements in the simple present and simple past tenses.
| Auxiliary Verb | Tense | Subjects | Example |
|---|---|---|---|
| Do | Simple present | I, you, we, they | Do you speak English? |
| Does | Simple present | He, she, it, singular nouns | Does she speak English? |
| Did | Simple past | All subjects | Did they speak English? |
Quick rule: Use do and does for the simple present tense. Use did for the simple past tense. When these words act as auxiliaries, the main verb normally stays in its base form.
Do vs Does vs Did: The Main Difference
1. When to use Do
Use do with I, you, we, and they in simple present questions and negative statements.
- Do you enjoy reading?
- I do not understand this question.
- They do not live in London.
2. When to use Does
Use does with he, she, it, and singular third-person subjects in the simple present tense.
- Does your brother work in Toronto?
- She does not eat meat.
- Does the computer need an update?
3. When to use Did
Use did with every subject when forming simple past questions and negatives.
- Did you finish your assignment?
- He did not attend the meeting.
- Did the students understand the lesson?
Remember: After auxiliary did, use the base verb, not the past-tense form.
Incorrect: Did you went home?
Correct: Did you go home?
How to Form Sentences Using Do, Does, and Did
Questions
Do / Does / Did + subject + base verb + …?
Does Maria study French?
Negative statements
Subject + do / does / did + not + base verb + …
Maria does not study French.
Emphatic statements
Subject + do / does / did + base verb + …
Maria does study French.
Step 1: Identify the tense
Decide whether the sentence describes a present situation or a past event.
Step 2: Identify the subject
Check whether the subject is I, you, we, they, he, she, or it.
Step 3: Select the correct auxiliary
Choose do, does, or did based on the tense and subject.
Step 4: Use the base form of the main verb
Avoid adding -s, -es, or a past-tense ending after the auxiliary.
Step 5: Check the sentence structure
For most direct yes/no questions, put the auxiliary before the subject. For negatives, place not after the auxiliary.
Do Does Did Auxiliary Verb Exercises: 100 Examples
The following 100 original examples cover basic grammar, daily conversations, academic writing, professional communication, emails, advanced structures, and common errors.
A. Basic Examples (1–20)
| No. | Example | Grammar Focus |
|---|---|---|
| 1 | Do you like apples? | Present question |
| 2 | Does he play chess? | Singular subject |
| 3 | Did you call your aunt? | Past question |
| 4 | I do not drink coffee. | Present negative |
| 5 | She does not watch television. | Singular negative |
| 6 | They did not travel yesterday. | Past negative |
| 7 | Do we need tickets? | Plural subject |
| 8 | Does the dog bark at strangers? | Singular noun |
| 9 | Did it rain last night? | Past weather question |
| 10 | You do speak clearly. | Present emphasis |
| 11 | He does understand the lesson. | Singular emphasis |
| 12 | I did complete the task. | Past emphasis |
| 13 | Do your friends live nearby? | Plural noun |
| 14 | Does this pen work? | Singular noun |
| 15 | Did she open the window? | Past action |
| 16 | We do not waste water. | Present negative |
| 17 | The shop does not open early. | Singular negative |
| 18 | The train did not arrive on time. | Past negative |
| 19 | Do I need permission? | First-person question |
| 20 | Did they enjoy the concert? | Past question |
Key lesson: The auxiliary changes according to tense and subject, while the following main verb remains in its base form.
B. Intermediate Examples (21–35)
| No. | Example | Grammar Focus |
|---|---|---|
| 21 | Why do people recycle plastic? | Why-question |
| 22 | Where does your cousin study? | Where-question |
| 23 | When did the museum close? | Past time question |
| 24 | How do these machines operate? | How-question |
| 25 | Why does the baby cry at night? | Singular question |
| 26 | What did the teacher explain? | Past information question |
| 27 | Do any of these solutions work? | Plural subject |
| 28 | Does anyone know the answer? | Indefinite pronoun |
| 29 | Did everybody receive an invitation? | Past question |
| 30 | I do not believe that explanation. | Present opinion |
| 31 | The manager does not approve every request. | Singular subject |
| 32 | We did not expect such a result. | Past negative |
| 33 | How often do you exercise? | Frequency |
| 34 | Which route does this bus follow? | Choice question |
| 35 | Why did the lights go out? | Past event |
Key lesson: Question words such as why, where, when, and how usually come before the auxiliary in information questions.
C. Daily Conversation Examples (36–50)
| No. | Example | Grammar Focus |
|---|---|---|
| 36 | Do you want some tea? | Offering |
| 37 | Does your sister drive? | Ability or habit |
| 38 | Did you sleep well? | Past experience |
| 39 | Do we have enough bread? | Household question |
| 40 | Does this restaurant serve breakfast? | Service question |
| 41 | Did you find your keys? | Completed action |
| 42 | I do not remember his address. | Present negative |
| 43 | My phone does not charge properly. | Everyday problem |
| 44 | We did not buy anything. | Past negative |
| 45 | Do your neighbors have a pet? | Present question |
| 46 | Does the library close at six? | Schedule question |
| 47 | Did you hear that announcement? | Past perception |
| 48 | I do appreciate your help. | Emphasis |
| 49 | She does enjoy gardening. | Emphasis |
| 50 | They did visit us last weekend. | Past emphasis |
Key lesson: These auxiliaries are common in everyday questions, especially when discussing routines, schedules, problems, and past experiences.
D. Academic and Student Examples (51–65)
| No. | Example | Grammar Focus |
|---|---|---|
| 51 | Do plants need sunlight to grow? | Scientific fact |
| 52 | Does gravity affect falling objects? | Scientific question |
| 53 | Did the researchers collect enough data? | Past research |
| 54 | Do these findings support the hypothesis? | Research analysis |
| 55 | Does the equation have two solutions? | Mathematics |
| 56 | Did the experiment produce consistent results? | Experimental outcome |
| 57 | Students do not always understand complex formulas immediately. | Academic observation |
| 58 | This theory does not explain every observation. | Academic limitation |
| 59 | The study did not include a control group. | Research methodology |
| 60 | Do historical records confirm this event? | Historical evidence |
| 61 | Does the author provide reliable sources? | Critical reading |
| 62 | Did the committee publish its findings? | Research reporting |
| 63 | Do all metals conduct electricity? | Scientific inquiry |
| 64 | Does the paragraph contain a clear topic sentence? | Writing analysis |
| 65 | Did the students submit their projects before the deadline? | Academic administration |
Key lesson: Do-support helps students form accurate research questions, describe limitations, and discuss results.
E. Business and Professional Examples (66–75)
| No. | Example | Grammar Focus |
|---|---|---|
| 66 | Do you manage the customer support team? | Job responsibility |
| 67 | Does the company offer remote positions? | Employment inquiry |
| 68 | Did the client approve the proposal? | Past decision |
| 69 | Do our sales figures match the forecast? | Business analysis |
| 70 | Does this contract require another signature? | Document review |
| 71 | Did the department meet its quarterly target? | Performance review |
| 72 | We do not share confidential information without authorization. | Workplace policy |
| 73 | The application does not support older browsers. | Technical limitation |
| 74 | The supplier did not deliver the materials on schedule. | Delivery issue |
| 75 | I do recognize the importance of your feedback. | Professional emphasis |
Key lesson: Accurate auxiliaries make professional questions clear and help distinguish present policies from past events.
F. Email Writing Examples (76–85)
| No. | Example | Grammar Focus |
|---|---|---|
| 76 | Do you have any updates regarding my application? | Follow-up email |
| 77 | Does the position require previous experience? | Recruitment email |
| 78 | Did you receive my attached resume? | Confirmation |
| 79 | I do appreciate your prompt response. | Polite emphasis |
| 80 | Our team does not require additional documents at this stage. | Information email |
| 81 | We did not receive the revised invoice. | Payment communication |
| 82 | Do you need any clarification before the meeting? | Professional support |
| 83 | Does the revised schedule work for your team? | Scheduling |
| 84 | Did the system send a confirmation message? | Technical follow-up |
| 85 | I do hope the information is helpful. | Courteous closing |
Key lesson: Do, does, and did can be useful in polite emails, although indirect questions often sound more formal.
For example:
Direct: Did you receive my application?
More formal: Could you please confirm whether you received my application?
G. Advanced Grammar Examples (86–95)
| No. | Example | Grammar Focus |
|---|---|---|
| 86 | Rarely do we encounter such a difficult problem. | Negative adverbial inversion |
| 87 | Not only does the course teach grammar, but it also improves writing. | Inversion |
| 88 | Little did they know that the schedule had changed. | Literary inversion |
| 89 | Never did I imagine such an outcome. | Emphatic inversion |
| 90 | Only then did the researchers identify the error. | Inversion after only then |
| 91 | I do believe that everyone deserves a fair opportunity. | Emphasis |
| 92 | She does seem confident about the interview. | Emphatic auxiliary |
| 93 | He did try to resolve the disagreement. | Past emphasis |
| 94 | Why do some people find irregular verbs difficult? | Complex question |
| 95 | How did the organization respond to the complaint? | Past information question |
Key lesson: In formal and advanced English, auxiliary do can also appear in emphatic constructions and inversion.
H. Common Mistake Examples (96–100)
| No. | Incorrect | Correct |
|---|---|---|
| 96 | Does he works here? | Does he work here? |
| 97 | Did she went to school? | Did she go to school? |
| 98 | Do your father drive? | Does your father drive? |
| 99 | He don’t like milk. | He doesn’t like milk. |
| 100 | They didn’t completed the project. | They didn’t complete the project. |
Key lesson: Never use the ordinary third-person -s ending or a past-tense form on the main verb after auxiliary do, does, or did.
Important Grammar Rules Students Should Remember
Rule 1: Do and does are used in the simple present
Use do with I, you, we, and they. Use does with he, she, it, and singular third-person nouns.
Rule 2: Did is used in the simple past
Did works with singular and plural subjects.
Rule 3: Use the base verb after auxiliary do, does, and did
Correct: Does she know the answer?
Incorrect: Does she knows the answer?
Rule 4: Do not add an unnecessary auxiliary before be
Incorrect: Does she is ready?
Correct: Is she ready?
Rule 5: Do not add do-support to ordinary modal questions
Incorrect: Do you can swim?
Correct: Can you swim?
Rule 6: Subject questions behave differently
When who or what is the subject, ordinary affirmative questions generally do not require do-support.
Correct: Who called you?
Incorrect: Who did call you? (Incorrect as an ordinary neutral question, although possible for emphasis.)
Rule 7: Do can also be a main verb
In “Do you do your homework?”, the first do is an auxiliary and the second do is the main verb.
Common Mistakes With Do, Does, and Did
| Common Mistake | Incorrect | Correct |
|---|---|---|
| Wrong subject agreement | Does they know? | Do they know? |
| Past verb after did | Did he ate? | Did he eat? |
| Missing auxiliary | Why she works here? | Why does she work here? |
| Wrong negative | She don’t agree. | She doesn’t agree. |
| Double past marking | Did you visited Paris? | Did you visit Paris? |
| Auxiliary with be | Do you are tired? | Are you tired? |
| Auxiliary with modal | Does he can help? | Can he help? |
| Incorrect negative | We didn’t went. | We didn’t go. |
These errors are particularly common among beginner learners because the main verb may change in affirmative sentences but return to its base form after an auxiliary.
Easy Tricks to Remember Do, Does, and Did
Think of three short reminders:
DO = Present + I / You / We / They
DOES = Present + He / She / It
DID = Past + Everyone
A useful memory trick is:
Does handles one third-person subject. Did handles yesterday. Do handles the other present-tense subjects.
This is a simplified reminder, not a complete description of every English sentence. For example, questions with be or modal verbs follow different patterns.
Practice Exercises: Fill in the Blanks
Choose do, does, or did.
- _____ you understand this chapter?
- _____ your mother speak Spanish?
- _____ they visit the museum yesterday?
- Why _____ the baby cry so often?
- _____ we need to submit the form today?
- _____ the teacher explain the answer last week?
- _____ these students attend online classes?
- _____ the computer require a password?
- Where _____ you spend your last vacation?
- _____ she work in the finance department?
- _____ the children enjoy reading comics?
- _____ the company announce the results yesterday?
- How often _____ your brother exercise?
- _____ I need to bring my identification?
- _____ the passengers receive a refund last month?
- Why _____ this application close unexpectedly?
- _____ your colleagues support the proposal?
- _____ he complete the training last Friday?
- _____ the local buses operate on Sundays?
- _____ your friend know the correct answer?
Practice Exercise Answer Key
| Question | Answer | Question | Answer |
|---|---|---|---|
| 1 | Do | 11 | Do |
| 2 | Does | 12 | Did |
| 3 | Did | 13 | Does |
| 4 | Does | 14 | Do |
| 5 | Do | 15 | Did |
| 6 | Did | 16 | Does |
| 7 | Do | 17 | Do |
| 8 | Does | 18 | Did |
| 9 | Did | 19 | Do |
| 10 | Does | 20 | Does |
Do, Does, Did: Five-Question Grammar Quiz
Test your understanding before checking the answers.
Interactive Grammar Quiz
0 of 5 answered
1. _____ your father work from home?DoDoesDid
2. _____ you see the notice yesterday?DoDoesDid
3. She _____ not understand the instructions.dodoesdid
4. Which sentence is correct?Did he went?Did he go?
5. Which sentence is correct?Does it work?Does it works?
Five Frequently Asked Questions About Do, Does, and Did
1. What is the difference between do, does, and did?
Do and does are used for simple present questions, negatives, and emphasis. Did is used for the simple past. The choice between do and does depends on the subject.
2. Can we use did with he, she, and it?
Yes. Did works with all subjects, including I, you, he, she, it, we, and they, when referring to the past.
3. Why do we use the base verb after does and did?
Because the auxiliary already carries the tense or agreement information. For example, “Does he play?” and “Did he play?” are correct.
4. Are do, does, and did always helping verbs?
No. They can also function as main verbs. In “She does her homework,” does is the main verb. In “Does she do her homework?”, the first word is an auxiliary and the second is the main verb.
5. How can I improve my use of do, does, and did?
Practice forming present and past questions, correcting errors, and rewriting affirmative sentences as negatives. Pay special attention to subject agreement and the base form of the main verb.
Conclusion
Learning do, does, and did is an important step toward speaking and writing accurate English. These three auxiliary verbs help you ask questions, form negatives, and emphasize ideas.
Remember the basic rule: Do for I, you, we, and they. Does for he, she, and it. Did for the past with every subject.
With 100 examples, practice exercises, and a downloadable worksheet, you have everything needed to strengthen this part of your English grammar.
Grammar improves with practice, not with guesswork. Even the smallest words deserve some attention!
How many answers did you get right in the quiz? Share your score in the comments, download the free worksheet, and explore more English grammar lessons on Catchy News World.
Educational disclaimer: This article provides general English grammar guidance for students, teachers, and language learners. Examples use standard English conventions. Usage may vary slightly across regional varieties and between formal and informal contexts.
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