Answer — Exercise 57.3
Unit 57 - Verb + -ing or to ... 2·English Grammar in Use
Question
Put the verb into the correct form.
Answer
1
- to keep
- knocking
- to put
- asking
- to reach
- to concentrate
2
- to go
- looking
- cleaning
- cutting
- to iron; ironing
3
- overhearing
- get / to get
- smiling
- make / to make