she said (it would be necessary for us to)stay here.这句话改变一下

she said (it would be necessary for us to)stay here.这句话改变一下
she said (it would be necessary for us to)stay here.
请用must和have to来代替下列带括号的部分
这句话must 可以理解,但是练习题答案还有
shesaid we had to stay here和she said we would have to stay here
我不太理解为什么还用 would have to
我不太理解为什么还用 have to
对不起打错了
我不太理解为什么还用 have to
对不起打错了
我不太理解为什么还用 have to
对不起打错了，不是已经有would have to