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來源：中考網 作者：紫涵 2013-01-30 16:45:04
2、在句子中，be有兩種主要作用：一是作為系動詞(The Linking Verb)，本身可以作用謂語動詞；二是做為助動詞(The Auxiliary Verb)，與謂語動詞一起構成各種時態和被動語態等。
下面做個簡要的講解。
一、be 動詞做系動詞
1、系動詞+表語”的結構
當be 動詞做系動詞使用時，主要構成“系動詞+表語”的結構，在句子中做謂語。表語可以是名詞、形容詞、副詞、介詞短語等。例如：
The man is a science teacher.
Mary's new dresses are colourful.
Mother is in the kitchen now.
I have been there before.
They shall be here at 10:00 tommorow.
That can't be true.
You are not being very polite.
Your brother is being very annoying this evening
2、be 動詞的一般疑問句，方法是把be 移到主語前面，也可說成是移到句首。
Is the man a science teacher? Yes, he is. / No, he isn't.
Are Mary's new dresses colourful? Yes, they are. / No, they aren't.
Was mother in the kitchen then? Yes, she was. / No, she wasn't.
Were you at home the day before yesterday? Yes, I was. / No, I wasn't.
Was she late this morning? Yes, she was. / No, she wasn't.
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