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2、在句子中，be有两种主要作用：一是作为系动词(The Linking Verb)，本身可以作用谓语动词；二是做为助动词(The Auxiliary Verb)，与谓语动词一起构成各种时态和被动语态等。 下面做个简要的讲解。 一、be 动词做系动词 1、系动词+表语”的结构 当be 动词做系动词使用时，主要构成“系动词+表语”的结构，在句子中做谓语。表语可以是名词、形容词、副词、介词短语等。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 动词的一般疑问句，方法是把be 移到主语前面，也可说成是移到句首。 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. (责任编辑：admin) |