Present Simple or Present Continuous? Open the brackets.

1) Where (to be) Boris? - He (to play) chess with his friend.

2) I (to be) in a hurry. My friends (to wait) for me.

3) You (not to write) what I (to say).

4) You (to like) opera? — Oh yes, I (to enjoy) it greatly. But my sister (not to like) it at all.