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.
