3.
1) He was not playing football with us yesterday
2) Were you reading a book at 7 o'clock?
3) Were they visiting their grandad in the morning?
4) Were the birds singing early in the morning?
5) What Ben was doing yesterday evening?
6) She was't sleeping at night
7) Was the teacher speaking to you?
4.
1) the
2) the
3) the
4) -, the Moskva river