you are supposed to have handed in your homework by now .by是个干啥的?别扭啊
问题描述：
you are supposed to have handed in your homework by now .by是个干啥的?别扭啊
you are supposed to have handed in your homework by now .by是个干啥的?别扭啊 能不能详解下 还有 The child is not yet able to write.The child is so young that he can't write yet.是不是都对 错了 请讲解
答
by在这里是到.为止的意思,by now就是到现在为止.后面两个句子都可以的