Ответ:

1. has been coming
2. has been practising
3. have been working
4. have been looking
5. have been going
6. has been performing

Ответ:

Ex.4.

2) She has been practising  ...

3) We have been working  ...

4) My parents have been looking  ...

5) I have been going  ...

6) David has been performing ...

Объяснение: