情态动词和几道选择题

1.It's vital that enough money____collected to get the project started.

A.is B be C.must be D.can be

答案是B 为什么不能用can be

2.____,we decided to leave at once, as we didn't want to risk missing the bus.

A.As it being pretty late B.It being pretty late

C.It was being pretty late.D.Being pretty late

答案是B C为什么不对？

3.Henry is often seen___English aloud every morning in the classroom

A.read B.reads C.reading D.to read

答案是C 不是be seen to do 那个词组吗？

1. 是个句型 it's+ 特殊形容词+ that + （should） be 此句为省洛should 用法。

2 此句为独立主格结构, 如果用c 该句就有两个主语 两个谓语 而中间又没有连词连接,语法上不成立.

3. 解析如下：
　be seen to do 是被看见要做什么
　be seen doing 是被看见正在做什么

He was seen to read a book
He was seen reading a book