Correct the mistakes. Explain.

1)  I have travelled a lot since you last saw me.

2) When he has called?

3) They had lived in Minsk for ten years and then they moved to Novgorod.

4) I did not have any English lessons this month.

5) Hi, I have seen Jane today. - Where have you seen her?

6) You know, Mr. Tipping has published a new book. - When has he published it?

7) How many books has Pushkin written?