初中英語知識(shí)點(diǎn)：Be動(dòng)詞定義及用法(3)

　　3、be 動(dòng)詞用在特殊疑問句

　　在特殊疑問句里，be 動(dòng)詞仍然移到主語前面，但特殊疑問句是以特殊疑問詞開頭的，所以be 動(dòng)詞只能說是移到主語前面，或者說是在特殊疑問詞的后面。例如：

　　Whose bike is broken? Xiao Ming's bike is.

　　Who was singing in the room? Mr. Zhang was.

　　Where are you from? I am from Wuhu.

　　What class were you in? We were in Class 2.

　　How old is Tom? He is ten.

　　4、be 動(dòng)詞的否定句

　　be 動(dòng)詞做謂語時(shí)，它的否定形式是在be 后加not，并且可以縮寫。例如：

　　It is not sunny today.

　　Tom and his friends are not in the park.

　　You were not nine years old when I went to the university.

　　He was not often late for his class when he was a student.

　　I wasn't here yesterday.

　　My parents weren't at home last Sunday.

　　5、be 動(dòng)詞的祈使句

　　be 動(dòng)詞的祈使句有肯定和否定兩種形式�？隙ㄐ问绞且詁e 動(dòng)詞開頭，而否定形式或強(qiáng)調(diào)句形，要加don't 或do。例如：

　　Be careful!

　　Be a good boy!

　　Don't be silly!

　　Don't be a fool!

　　Do be obedient!

　　Do be careful.

　　二、be 動(dòng)詞做助動(dòng)詞

　　助動(dòng)詞be 有兩個(gè)基本用法，一是與謂語動(dòng)詞一起構(gòu)成各種時(shí)態(tài)，二是構(gòu)成被動(dòng)語態(tài)。

　　1、“be + 現(xiàn)在分詞組”成各種進(jìn)行式時(shí)態(tài)。例如：

　　Tony's maid is washing his new car.

　　The children are playing in the field.

　　Samuel was eating when I came in.

　　We have been living here since 1959.

　　This time next day they will be sitting in the cinema.
 

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