來源:中考網(wǎng) 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(dòng)詞(The Linking Verb),本身可以作用謂語動(dòng)詞;二是做為助動(dòng)詞(The Auxiliary Verb),與謂語動(dòng)詞一起構(gòu)成各種時(shí)態(tài)和被動(dòng)語態(tài)等。
下面做個(gè)簡(jiǎn)要的講解。
一、be 動(dòng)詞做系動(dòng)詞
1、系動(dòng)詞+表語”的結(jié)構(gòu)
當(dāng)be 動(dòng)詞做系動(dòng)詞使用時(shí),主要構(gòu)成“系動(dòng)詞+表語”的結(jié)構(gòu),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(dòng)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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