you make lunch ,____for____(but,and,for,or)I'll take care of the baby.
表示原因
and
因为是并列的关系。你做饭我来看孩子。
you _______ (can't / shouldn't / mustn't /needn't ) be serious. you're actually going to lend him money again?那这道应该选 shouldn't
你不应该当真 。。。。
needn't的意思是 不做也可以 做了也行
shouldn't的意思是 不应该做 做了就是错的
and
and 祈使句+and+陈述句
and 前后两句是并列关系!