助动词短语(半助动词) be about to, be due to, be going to, be likely to, be meant to, be supposed to, be willing to, have to, seem to, be unable to, be unwilling to 在功能上介于主要动词和助动词之间的一类结构 其他助

动词 shall, will, should，

would 无词义，主要用来构成将来时 　　　　[即时演练1]

　　　用适当的助动词填空

　　①In the past, many students did not know the importance of English.

　　②I haven't (not) seen him for a long time.

　　③Only when we began our college life did we realize the importance of English.

　　④I bought this watch here yesterday, but it doesn't work.

　　⑤He will come to the office this afternoon.

　　⑥These books are not supposed to be taken out of the reading­room.

语法点三 基本助动词的用法 1. 助动词be的用法

用法 例句 be ＋现在分词，构成进行时态 English is becoming more and more important.

They were having a meeting. be ＋过去分词，构成被动语态 English is taught throughout the world.

The window was broken by Tom. be ＋

动词不定式 表示最近、未来的计划或安排 He is to go to New York next week. 表示命令 You are to explain this. 　　[即时演练2]

　　(1)完成句子

　　①她现在正在写一本书。

　　She is_writing a book now.

　　②当我到达那里时，他们正在看电视。

　　They were_watching_TV when I got there.

　　③很多人在地震中丧生。

Many people were_killed in the earthquake.