我目前在自学语法 关于be动词和助动词do 的用法总混淆 比如 这一题
I wrote six letters yesterday
标准答案是 who did ou write to 我写成了 who were you writeing to 。。。
还有一题 Sarah (isn.t doing) her shopping during the week. she always does it
标准答案是 Sarah doesn.t do her shopping during the week. she always does it
请各位答疑一下,以及比较好的辨别 用be还是do 的方法,谢谢大家了