主语(S)+不及物动词(Vi)+主语补语(SC)(下)

音频要点：

名词及其短语可以作为补语。比如：

David is my younger brother. David是我的弟弟。

He is a smart boy. 他是个聪明的孩子。

My father is a math(mathematics) teacher. 我父亲是位数学老师。

介系词（即介词，下文同）及其短语可以作为补语。比如：

John and Mary are in love. John跟Mary谈恋爱了。

He often complains about his low salary. 他常常抱怨薪水太低了。

I'm afraid of cockroaches. 我怕蟑螂。

从句可以作为补语。比如：

The problem is that I don't know him. 问题是我不认识他。

I'm sure he doesn't like cheese. 我确定他不喜欢起司。

不定式可以作为补语。比如：

She is always quick to react. 她一向反应很快。

It's sure to rain. 一定会下雨。

Don't be afraid to ask questions. 不要怕问问题。