请用must和have to来代替下列带括号的部分.

题目

请用must和have to来代替下列带括号的部分.
she said (it would be necessary for us to)stay here.
(it is necessary for me to)have some help.
(it was be necessary for him to)go out last night.
对他来说昨晚出去是必要的
he must had go out last night
i must had have some help
she said we have to stay here
对么 不懂 一定要说明
并说明为什么

答案

must一般指主观的,而have to 指客观,so the first sentence should use "have to",because 这是她说的,说明有外在因素
第二句应用must ,这是我说,表示主观
第三句两个都可以,没有什么限定
must 和have to 都是情态动词,后面应加动词原形
还有主谓句时态应保持一致,你要认真检查哦!