Infinitive grammar worksheet with exercises and rules for using "to" with infinitives.

Let's solve this grammar exercise on infinitives step by step, based on the rules provided in the image.

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🔹 Rules Recap (from the image):

- "To" is NOT used after:
- Modal verbs: *must, can (could), may (might), need*
- Verbs like *make, let*
- After *see, watch, hear, feel* in Objective Infinitive Complex
- After expressions: *"had better", "would rather", "would sooner"*

- "To" IS used in other cases (e.g., after *want, like, expect, plan*, etc.)

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Now, let’s go through each sentence and fill in "to" where necessary.

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✔ Solutions with Explanations

1. I can ____ (help) you with this exercise.
→ help
✘ No "to" after modal verb can.
✔ I can help you...

2. He likes ____ (play) volley-ball after school.
→ to play
✔ "like" is followed by to + infinitive.
✔ He likes to play...

3. Helen made me ____ (laugh) a lot with her funny stories.
→ laugh
✘ No "to" after make (verb of causation).
✔ made me laugh

4. You'd better ____ (see) this film yourself. It's very interesting.
→ see
✘ No "to" after had better.
✔ You'd better see...

5. I want ____ (take part) in this competition.
→ to take part
✔ "want" requires to + infinitive.
✔ I want to take part...

6. We expect Nick ____ (arrive) on Monday morning.
→ to arrive
✔ "expect" is followed by to + infinitive.
✔ We expect Nick to arrive...

7. ____ (work) in the garden was a pleasure.
→ To work
✔ This is a subject infinitive (noun function).
✔ To work in the garden was a pleasure.

8. It may ____ (snow) in the morning.
→ snow
✘ No "to" after modal verb may.
✔ It may snow...

9. I'm happy ____ (hear) that you have passed your exam.
→ to hear
✔ "happy" is followed by to + infinitive.
✔ I'm happy to hear...

10. You had better ____ (go) there right now.
→ go
✘ No "to" after had better.
✔ You had better go...

11. Ann said she would rather ____ (visit) Paris than Liverpool.
→ visit
✘ No "to" after would rather.
✔ would rather visit

12. I know that you can ____ (speak) three languages.
→ speak
✘ No "to" after can (modal verb).
✔ you can speak

13. I let my sister ____ (invite) all her friends.
→ invite
✘ No "to" after let (causative verb).
✔ I let my sister invite...

14. I intend ____ (talk) to her about it.
→ to talk
✔ "intend" is followed by to + infinitive.
✔ I intend to talk...

15. Ask your friend ____ (help) you with this problem.
→ to help
✔ "ask" is followed by to + infinitive.
✔ Ask your friend to help...

16. He began ____ (go) in for football last year.
→ to go
✔ "begin" is followed by to + infinitive.
✔ He began to go...

17. I went to the conference ____ (listen) to my friend's report.
→ to listen
✔ Purpose infinitive — use to + infinitive.
✔ I went... to listen...

18. Your duty is ____ (feed) the parrot regularly.
→ to feed
✔ "is" + infinitive = subject complement.
✔ Your duty is to feed...

19. She asked me ____ (call) Andrew immediately.
→ to call
✔ "ask" + object + to + infinitive.
✔ She asked me to call...

20. Mike wants ____ (install) the new equipment.
→ to install
✔ "want" + to + infinitive.
✔ Mike wants to install...

21. We like ____ (have) tea with sandwiches.
→ to have
✔ "like" + to + infinitive.
✔ We like to have...

22. Our plan is ____ (visit) Rome and Paris.
→ to visit
✔ "is" + infinitive as subject complement.
✔ Our plan is to visit...

23. I'm really upset ____ (hear) this news.
→ to hear
✔ "upset" + to + infinitive (emotion + reason).
✔ I'm upset to hear...

24. Tom asked me ____ (choose) the book for his sister.
→ to choose
✔ "ask" + object + to + infinitive.
✔ Tom asked me to choose...

25. Pam wanted me ____ (come) there early in the morning.
→ to come
✔ "wanted" + object + to + infinitive.
✔ Pam wanted me to come...

26. I would rather ____ (stay) at home in such a bad weather.
→ stay
✘ No "to" after would rather.
✔ I would rather stay...

27. I watched my little son ____ (play) in the yard.
→ play
✘ After watch, we use bare infinitive (no "to") in Objective Infinitive Complex.
✔ I watched my son play...
⚠️ Note: If it were "watched him playing", that would be continuous action. But here, it's a completed action or general observation → play (bare infinitive).

28. ____ (swim) is such a pleasure.
→ To swim
✔ Subject infinitive.
✔ To swim is such a pleasure.

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✔ Final Answers:

1. help
2. to play
3. laugh
4. see
5. to take part
6. to arrive
7. To work
8. snow
9. to hear
10. go
11. visit
12. speak
13. invite
14. to talk
15. to help
16. to go
17. to listen
18. to feed
19. to call
20. to install
21. to have
22. to visit
23. to hear
24. to choose
25. to come
26. stay
27. play
28. To swim

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📝 Summary Tips:

- No "to" after: modals, *make/let*, *had better*, *would rather*, and sensory verbs (*see, watch, hear, feel*) when showing complete action.
- Use "to" after: *want, like, expect, ask, begin, intend*, etc.
- Subject infinitives: Start with "To + verb" (e.g., *To swim is fun*).
- After "be" + noun/pronoun: Use to + infinitive (e.g., *My job is to teach*).

Let me know if you'd like a printable version or flashcards! 😊