关于情态动词的两道题
问题描述：
关于情态动词的两道题
sir,you _________ be sitting in this waiting room .it is for women and children only.
A、oughtn't to
B、can't
i wasn't supposed to go to the movies,but i ____ going.
a.cannot help
b.couldn't help
答
a b
第一题can`t表示不可能,oughtn`t不应该
第二题注意时态就行