用所给动词的正确形式填空。

1. Kate, don't forget ______ (buy) some bread. There is little at home.

2. I ______ (not watch) TV yesterday, because I had a lot of things ______ (do).

3. You can't ______ (leave) before nine.

4. His home ______ (be not) far from school, so he usually _______ (come) on foot.

5. It ______ (snow) heavily last night. Let's             (go) and              (make) a snowman.

6. I ______ ( not see) Mary last week. I want to know where she _______ (be) now.