用am is are am not isn't aren't填空,怎么填呢?

用am,is,are 用am,is,are 用am is are造句 用is,am,are填空 用are is am填空 用am.is.are填空, 用am ,is ,are回答 用am,is,are 填空, 用am/are/is/am not/isn't/aren't 填空：Your cousin_______ a cute baby. 用am is are am not isn't aren't填空,怎么填呢? 用am/are/is/am not/isn't/aren't 填空:____it an Engish book? 用am/are/is/am not/isn't/aren't 填空:_____they my pens? 用am / are /is/am not /isn't/aren't 填空：The and I _____friends. am is are 过去式 是am is are am is are. am、is、are、 is am are