用must或have to的适当形式填空

问题描述:

用must或have to的适当形式填空
1、She is ill I _______ book after her.
2、It is raining.I _____________ take an umbrella.
3、Do not run=_________________________.

1 have to ( book应该是 look )
2 have to
3 musn't run 和下边那位答得不太一样 我凌乱了have to 强调‘客观’原因
must强调‘ 主观认为’

1 妈妈病了,不得不在家照顾她(一定是用have to )
3 表示‘ 命令,禁止’ 意思是:别跑( 用 mustn't run )