This worksheet helps students practice identifying and correcting auxiliary verbs in various sentences.
Auxiliary verbs worksheet featuring 14 sentences for grammar correction practice with a cartoon dog.
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Show Answer Key & Explanations
Step-by-step solution for: Auxiliary Verbs Worksheets - 15 Worksheets Library
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Show Answer Key & Explanations
Step-by-step solution for: Auxiliary Verbs Worksheets - 15 Worksheets Library
Let's go through each sentence and determine whether the auxiliary verb used is correct. If it is, we write the sentence as is. If not, we correct the auxiliary verb.
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1. Mark do join us if we call him.
✘ Incorrect. "Do" is not the correct auxiliary verb here. The correct form should be "will" or "does", depending on meaning. Since this is a conditional ("if we call him"), the intended meaning is likely future tense.
✔ Mark will join us if we call him.
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2. Jim was feeling under the weather.
✔ Correct. "Was" is the past tense of the auxiliary verb "be", correctly used with the past continuous tense.
✔ Jim was feeling under the weather.
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3. Kim were sitting over there.
✘ Incorrect. "Were" is plural; "Kim" is singular. The correct auxiliary verb is "was".
✔ Kim was sitting over there.
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4. We was wondering about you.
✘ Incorrect. "Was" is singular; "We" is plural. The correct auxiliary verb is "were".
✔ We were wondering about you.
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5. Liam will driving last year.
✘ Incorrect. "Will" cannot be used with past time ("last year"). For past events, use past tense. Also, "driving" needs an auxiliary verb like "was".
✔ Liam was driving last year.
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6. Mary have clean up her room.
✘ Incorrect. "Have" is not correct here. This is a simple past action. The correct auxiliary verb is "had" (past perfect) or just "cleaned" without an auxiliary. But since the sentence uses "have", it's likely meant to be "has" for present perfect. However, the verb "clean" should be in past participle: "cleaned".
✔ Mary has cleaned up her room.
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7. Tom did hurry through his chores every day.
✔ Correct. "Did" is used as an auxiliary verb to emphasize the past action. It’s grammatically correct in this context.
✔ Tom did hurry through his chores every day.
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8. Let me know when she have returned.
✘ Incorrect. "Have" should be "has" because "she" is third person singular.
✔ Let me know when she has returned.
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9. Frank could help with this, I think.
✔ Correct. "Could" is a modal auxiliary verb used appropriately here to express possibility or permission.
✔ Frank could help with this, I think.
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10. Must you whistle?
✔ Correct. "Must" is a modal auxiliary verb used to ask about necessity.
✔ Must you whistle?
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11. Sam must call, but he probably won't.
✔ Correct. "Must" expresses obligation, and "won't" uses "will not" — both are correct auxiliary verbs.
✔ Sam must call, but he probably won't.
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12. This cake has baked to perfection.
✘ Incorrect. "Has baked" is incorrect because "bake" is an intransitive verb here, but more importantly, passive voice is implied. The correct form is "has been baked".
✔ This cake has been baked to perfection.
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13. Rachel be slipping off her chair.
✘ Incorrect. "Be" is not correct here. This should be present continuous tense. The correct auxiliary verb is "is".
✔ Rachel is slipping off her chair.
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14. Vince has become so funny.
✔ Correct. "Has" is the correct auxiliary verb for present perfect tense.
✔ Vince has become so funny.
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1. Mark will join us if we call him.
2. Jim was feeling under the weather.
3. Kim was sitting over there.
4. We were wondering about you.
5. Liam was driving last year.
6. Mary has cleaned up her room.
7. Tom did hurry through his chores every day.
8. Let me know when she has returned.
9. Frank could help with this, I think.
10. Must you whistle?
11. Sam must call, but he probably won't.
12. This cake has been baked to perfection.
13. Rachel is slipping off her chair.
14. Vince has become so funny.
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✔ All sentences corrected with proper auxiliary verbs explained.
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1. Mark do join us if we call him.
✘ Incorrect. "Do" is not the correct auxiliary verb here. The correct form should be "will" or "does", depending on meaning. Since this is a conditional ("if we call him"), the intended meaning is likely future tense.
✔ Mark will join us if we call him.
---
2. Jim was feeling under the weather.
✔ Correct. "Was" is the past tense of the auxiliary verb "be", correctly used with the past continuous tense.
✔ Jim was feeling under the weather.
---
3. Kim were sitting over there.
✘ Incorrect. "Were" is plural; "Kim" is singular. The correct auxiliary verb is "was".
✔ Kim was sitting over there.
---
4. We was wondering about you.
✘ Incorrect. "Was" is singular; "We" is plural. The correct auxiliary verb is "were".
✔ We were wondering about you.
---
5. Liam will driving last year.
✘ Incorrect. "Will" cannot be used with past time ("last year"). For past events, use past tense. Also, "driving" needs an auxiliary verb like "was".
✔ Liam was driving last year.
---
6. Mary have clean up her room.
✘ Incorrect. "Have" is not correct here. This is a simple past action. The correct auxiliary verb is "had" (past perfect) or just "cleaned" without an auxiliary. But since the sentence uses "have", it's likely meant to be "has" for present perfect. However, the verb "clean" should be in past participle: "cleaned".
✔ Mary has cleaned up her room.
---
7. Tom did hurry through his chores every day.
✔ Correct. "Did" is used as an auxiliary verb to emphasize the past action. It’s grammatically correct in this context.
✔ Tom did hurry through his chores every day.
---
8. Let me know when she have returned.
✘ Incorrect. "Have" should be "has" because "she" is third person singular.
✔ Let me know when she has returned.
---
9. Frank could help with this, I think.
✔ Correct. "Could" is a modal auxiliary verb used appropriately here to express possibility or permission.
✔ Frank could help with this, I think.
---
10. Must you whistle?
✔ Correct. "Must" is a modal auxiliary verb used to ask about necessity.
✔ Must you whistle?
---
11. Sam must call, but he probably won't.
✔ Correct. "Must" expresses obligation, and "won't" uses "will not" — both are correct auxiliary verbs.
✔ Sam must call, but he probably won't.
---
12. This cake has baked to perfection.
✘ Incorrect. "Has baked" is incorrect because "bake" is an intransitive verb here, but more importantly, passive voice is implied. The correct form is "has been baked".
✔ This cake has been baked to perfection.
---
13. Rachel be slipping off her chair.
✘ Incorrect. "Be" is not correct here. This should be present continuous tense. The correct auxiliary verb is "is".
✔ Rachel is slipping off her chair.
---
14. Vince has become so funny.
✔ Correct. "Has" is the correct auxiliary verb for present perfect tense.
✔ Vince has become so funny.
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Final Answers:
1. Mark will join us if we call him.
2. Jim was feeling under the weather.
3. Kim was sitting over there.
4. We were wondering about you.
5. Liam was driving last year.
6. Mary has cleaned up her room.
7. Tom did hurry through his chores every day.
8. Let me know when she has returned.
9. Frank could help with this, I think.
10. Must you whistle?
11. Sam must call, but he probably won't.
12. This cake has been baked to perfection.
13. Rachel is slipping off her chair.
14. Vince has become so funny.
---
✔ All sentences corrected with proper auxiliary verbs explained.
Parent Tip: Review the logic above to help your child master the concept of auxiliary verb worksheet.
