Must , can/could, may/might 的用法
must
1.must 表示推测时, 只能用于肯定句。
must do 对一般时的肯定推测
must have done 对过去发生的事情作出的肯定判断
must be doing/do 对现在的动作进行肯定推测
他们买了一辆新车。 他们一定很有钱。
They have bought a new car. They must have a lot of money.
他现在一定在看小说。
He must be reading novels now.
路是湿的。昨天晚上一定下雨了。
The road is wet. It must have rained last night.