时态填空。

1. What are you doing, children? We              (make) a snowman.

2. My mother              (want) a tube of tooth-paste.

3. There              (be) some ice-cream in the refrigerator.

4. Then eat some beans or I can't              (give) you any ice-cream.

5. Sue is still               (help) her.

简述会计核算的基本方法。