什么时候用be,什么时候用are?答:be动词的用法 be [bi:]vi 现在时 I am, you are, he is, we are, you are, they are (缩略式 I'm, you're, he's, we're, you're, they're), (否定缩略式 I'm not, isn't, aren't), 过去时 I was, you were, he was, we were, you were, they were (过去时...
判断用哪个be动词要根据什么原则?答:有不同的be动词,基本上为:am,is,are,was,were,been,being,be 用法 be (be/is/are/am/was/were)[bi:]vi he is, we are, you are, they are (缩略式 I'm, you're, he's, we're, you're, they're), (否定缩略式 I'm not, isn't, aren't), 过去时 I was, you ...