我想知道be动词和助动词do用法上的区别
I play ball 和 I am play ball这两句话有什么区别?I am play ball这句话是正确的吗?
I didn't answer the phone可以换成I wasn't answer the phone吗?这两句话有什么区别?
呃 写错了 应该是I didn't answer the phone可以换成I wasn't answered the phone吗？这两句话有什么区别？