Identify the non-finite verbs in the following sentences and say whether they are infinitives, gerunds or participles.

1. That was a wonderful place to go skiing.

2. Trespassing is prohibited.

3. Swimming is a good exercise.

4. He has promised to buy me a drink.

5. We are interested in hiring their service.

6. I am thinking of writing an autobiography.

7. They have decided to part ways.

8. Swimming against the current is not an easy task.

9. We saw logs floating on the water.

10. Sitting on a branch, the monkey gibbered.

11. Crying loudly, she ran out of the room.

12. Shouting loudly, he drew our attention.

Answers

1. to go, skiing (to go – infinitive; skiing – gerund)

2. Trespassing (trespassing – gerund)

3. Swimming (swimming – gerund)

4. to buy (to buy – infinitive)

5. hiring (hiring – gerund; an ing form used as the object of a preposition is a gerund)

6. writing (writing – gerund)

7. to part (to part – infinitive)

8. Swimming (swimming – gerund)

9. floating (floating – participle)

10. Sitting (sitting – present participle)

11. Crying (crying – present participle)

12. Shouting (shouting – present participle)