高中英语试题一般选项出现 mustn't can`t shouldn`t 等词考的是什么?还有那哪些会出现的选项

考的是情态动词 举例说明
1.You mustn't stand near the river .(表示禁止）
2.---The girl speaking to him must be his sister（用于肯定句,对现在的推测）
---No,she can't ,she is in France ( can't 用于否定句,对现在的推测 ）
3.You shouldn't(不应该 表示责备）/ mustn't （ 表示禁止）take the book out of the library.
4.-He must have known the news (用于肯定句,对过去的推测）
--He can't have .(用于否定句,对过去的推测）