1.Mother usually goes (shopping) on Sundays.

问题描述:

1.Mother usually goes (shopping) on Sundays.
2.You'd better hurry;don't keep them (waiting).
3.Please (write) for me for a moment.I am coming.
呃,答案我知道,想问一下每题的原因(打括号的是答案)

1.go shopping 固定搭配,购物
2.keep+动词ing形式
3.祈使句动词原形引导的啊