III. Complete the sentences with for / since 1. We have known each other for / since our childhood.

2. My parents haven’t travelled abroad for / since a long time.

3. I haven’t seen my friend Den for / since last summer.

4. They’ve had this car for / since 4 years.

5. I’ve been reading this book for / since three hours.

IV. Complete the sentences with the Present Perfect or Present Perfect Continuous forms of the verbs in brackets.

1.We ( see) this film before.

2. It (rain) for two hours.

3.They ( work) since 9 o’clock.

4. Your mother already (come).

5.They (not / finish) their work yet.