1、this是代词,这、这个的意思,指较近的人或事物,例如,How long have you been living in this country? 你在这个国家居住多久啦?Is this your bag? 这是你的包吗?

3、by this time是已经的意思,举个例子,I thought you'd be done by this time. 我以为你这之前已经完成了。

1、this是代词,这、这个的意思,指较近的人或事物,例如,How long have you been living in this country? 你在这个国家居住多久啦?Is this your bag? 这是你的包吗?
3、by this time是已经的意思,举个例子,I thought you'd be done by this time. 我以为你这之前已经完成了。