is am are什么时候做助动词?

is am are什么时候做助动词? 助动词am is are am,is,are是不是助动词 在英语句子中,什么时候用助动词do\does ,什么时候用be动词am\is\are? 助动词怎么用?is am are was were分别用在什么时候``有什么区别``? am,is,are是不是助动词,快 英语句子中什么时候用be动词(am/is/are )什么时候用助动词(do/does) .求详解 am is are 做谓语时什么时候不被翻译 助动词和实义动词能做谓语 am is are was were +doing这里的am is are was were 什么时候用be is are am 英语 什么时候 用 am is are? 什么时候用be,而不是am,is,are