This worksheet challenges students to correctly identify and use infinitives, gerunds, and participles in various sentence structures.

Let's solve the exercise step by step. The task is to put the verbs in brackets into the correct form — either infinitive, gerund, or participle — depending on the context.

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🔹 Rules Recap:

- Infinitive: "to + verb" (e.g., *to go*, *to eat*)
- Gerund: "-ing" form (e.g., *going*, *eating*)
- Participle: Present participle ("-ing") or past participle ("-ed" or irregular), often used in passive or continuous constructions.

Some verbs are followed by only gerunds (e.g., *enjoy, avoid, mind*), others only by infinitives (e.g., *decide, hope, promise*), and some can take both (with a change in meaning).

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Now let’s go through each sentence:

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1. I caught him (climb) over the wall.
→ climbing
✔ "Catch someone doing something" → present participle
👉 *I caught him climbing over the wall.*

2. I asked him (explain) but he refused (say) anything, so in the end I had (let) him go.
→ to explain, to say, to let
✔ "ask someone to do" → infinitive
✔ "refuse to do" → infinitive
✔ "have to do" → infinitive
👉 *I asked him to explain... he refused to say... I had to let him go.*

3. I hate (see) a girl (cry).
→ seeing, crying
✔ "hate doing" → gerund
✔ "see someone doing" = see the action happening → present participle
👉 *I hate seeing a girl crying.*

4. It was very unpleasant (wake) up and (hear) the rain (beat) on the windows.
→ to wake, hearing, beating
✔ "It is unpleasant to do" → infinitive
✔ "and" connects two parts: first is infinitive, second should be parallel → hearing (gerund)
But note: "It was unpleasant to wake up and hear..." would also be acceptable. However, since "to wake" is already infinitive, and "hear" is part of the same idea, it can be infinitive too. But "hearing" is also possible for balance.

However, "to wake up and to hear" is awkward with double "to". So better:
✔ to wake, hearing, beating
→ "It was very unpleasant to wake up and hear the rain beating on the windows."
Wait: "hear the rain beating" → present participle after "hear" when describing ongoing action.

So:
👉 *It was very unpleasant to wake up and hear the rain beating on the windows.*
✔️ All correct.

5. The snow kept (fall) and the workmen grew tired of (try) (keep) the roads clear.
→ falling, trying, keeping
✔ "kept doing" → gerund
✔ "tired of doing" → gerund
✔ "trying to keep" → gerund + infinitive
👉 *The snow kept falling... tired of trying to keep the roads clear.*

6. Do you remember (hear) the bombs (drop)?
→ hearing, dropping
✔ "remember doing" = recall having done → gerund
✔ "hear the bombs dropping" → present participle (action in progress)
👉 *Do you remember hearing the bombs dropping?*

7. Peter used (like) (sit) beside the railway line and (watch) the trains (go) by. He got very good at (know) the different types of engine.
→ to like, sitting, watching, going, knowing
✔ "used to like" → infinitive (note: "used to" + infinitive)
✔ "used to sit" → infinitive
But here: "Peter used to like sitting..." → correct
"used to like" means he liked it in the past.
Then: "sitting", "watching", "going" → all gerunds after "like", "watch", "go"
"get good at doing" → gerund
👉 *Peter used to like sitting beside the railway line and watching the trains going by. He got very good at knowing the different types of engine.*

Note: "going by" is correct — "watch the trains go by" is common, but "watching the trains going by" emphasizes the process.

8. It’s no good (write) to him; he can’t read. The only thing (do) is (go) and (see) him.
→ writing, to do, to go, to see
✔ "It’s no good doing" → gerund
✔ "the only thing to do" → infinitive (noun phrase: "thing to do")
✔ "is to go and to see" → infinitive (after "is", subject complement)
👉 *It’s no good writing to him... The only thing to do is to go and to see him.*

9. The enemy began (fire). He felt bullets (strike) the wall behind him.
→ to fire, striking
✔ "begin to do" → infinitive
✔ "feel something doing" → present participle (emphasizes the action as it happens)
👉 *The enemy began to fire. He felt bullets striking the wall behind him.*

10. He heard the clock (strike) six and knew it was time for him (get) up.
→ strike, to get
✔ "hear the clock strike" → bare infinitive (common with "hear" + verb without "to")
✔ "time for someone to do" → infinitive
👉 *He heard the clock strike six... time for him to get up.*

11. I did not know how (get) to your house so I stopped (ask) the way.
→ to get, to ask
✔ "how to do" → infinitive
✔ "stopped to ask" → infinitive (purpose: stopped in order to ask)
👉 *I didn't know how to get to your house, so I stopped to ask the way.*

12. I wish my fridge would stop (make) that horrible noise. You can’t hear anyone (speak).
→ making, speaking
✔ "stop doing" → gerund (stop an ongoing action)
✔ "hear someone speaking" → present participle (ongoing action)
👉 *I wish my fridge would stop making that noise. You can’t hear anyone speaking.*

13. I can hear the bell (ring) but nobody seems (be coming) (open) the door.
→ ringing, to be coming, to open
✔ "hear the bell ringing" → present participle (continuous sound)
✔ "seems to be coming" → infinitive (progressive form)
✔ "to open" → infinitive (purpose: why they're coming?)
But "nobody seems to be coming to open the door" makes sense.
So:
👉 *I can hear the bell ringing, but nobody seems to be coming to open the door.*

14. Ask him (come) in; don’t keep him (stand) at the door.
→ to come, standing
✔ "ask someone to do" → infinitive
✔ "keep someone doing" → present participle (cause someone to continue doing)
👉 *Ask him to come in; don’t keep him standing at the door.*

15. Do you feel like (go) to the club or would you rather (stay) at home?
→ going, stay
✔ "feel like doing" → gerund
✔ "would rather do" → infinitive (without "to")
👉 *Do you feel like going to the club or would you rather stay at home?*

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✔ Final Answer with Correct Forms:

1. I caught him climbing over the wall.
2. I asked him to explain but he refused to say anything, so in the end I had to let him go.
3. I hate seeing a girl crying.
4. It was very unpleasant to wake up and hear the rain beating on the windows.
5. The snow kept falling and the workmen grew tired of trying to keep the roads clear.
6. Do you remember hearing the bombs dropping?
7. Peter used to like sitting beside the railway line and watching the trains going by. He got very good at knowing the different types of engine.
8. It’s no good writing to him; he can’t read. The only thing to do is to go and to see him.
9. The enemy began to fire. He felt bullets striking the wall behind him.
10. He heard the clock strike six and knew it was time for him to get up.
11. I did not know how to get to your house so I stopped to ask the way.
12. I wish my fridge would stop making that horrible noise. You can’t hear anyone speaking.
13. I can hear the bell ringing but nobody seems to be coming to open the door.
14. Ask him to come in; don’t keep him standing at the door.
15. Do you feel like going to the club or would you rather stay at home?

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📝 Summary of Key Patterns:

| Structure | Form |
|--------|------|
| catch/see/hear + person + doing | present participle |
| ask/tell/want + person + to do | infinitive |
| remember/regret + doing | gerund (past experience) |
| stop + doing | gerund (stop an action) |
| stop + to do | infinitive (stop in order to do) |
| feel + doing | present participle |
| feel + do | bare infinitive (completed action) |
| seem + to be doing | progressive infinitive |
| would rather + do | infinitive |
| feel like + doing | gerund |
| it’s no good + doing | gerund |
| get good at + doing | gerund |

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