草原之夜mp3下载:什么时候使用单词be教我吧 谢谢了!

来源:百度文库 编辑:高考问答 时间:2024/04/28 08:08:41
我说的不是am,are,is,were,was,这些就是说be教我吧 谢谢了

1 祈使句。如,Be quiet! 安静!
2 情态动词后。如,He can be a thief.他可能是个小偷。
3 助动词后。如,He will be here in two hours.他两小时后到。
4 某些行为动词后。如,He wants to be a teacher. 他想当老师。

一句话,就是在使用动词原形的时候用be。

be指中文的“是”,分第一人称单数am,第3人称单数is,第一第二第三人称复数及第二人称单数are。I-am you/we/they-are he/she/it-is .be的过去式是was/were .
例:
I am a boy.
you are smart.
she is our teacher.
when I was a baby,I could sing.
where were you born.
缩写:
he is--he's
she is--she's
you are--you're
I am--I'm
it is--it's
we are--we're
here is--here's
there are--there're
is not--isn't......

(this is,am not 等不能缩写)