百度作业网英语(固定短语的使用 )
来源：学生作业帮 编辑：百度作业网作业帮 分类：英语作业 时间：2024/05/11 16:39:37
from then，by then，by that time，since that time各是什么意思？？？请老师解答。
解题思路： 掌握表示时间的不同介词短语的使用方法
解题过程：
from then on 从今以后
by then到那时
If you're not better by then, I'll take you to see the doctor.
如果你到那时还不好，我就带你去看医生。
We had learned one thousand English words by then.
到那时为止，我们已学了一千个英语单词。
【记忆技巧】then用于介词之后，只需记住两个单词各有意义就行了。 by then是由 by(到……为止)和then(那时)合成的
by that time 到那时;截止那个时候 一般与完成时连用.
We had learned 5000 words by that time when we graduated.
from that time 从那时起=since then 一般与完成时连用.
I have slept late from that time. since that time 自从那个时候起，常与完成时连用
最终答案：略
解题过程：
from then on 从今以后
by then到那时
If you're not better by then, I'll take you to see the doctor.
如果你到那时还不好，我就带你去看医生。
We had learned one thousand English words by then.
到那时为止，我们已学了一千个英语单词。
【记忆技巧】then用于介词之后，只需记住两个单词各有意义就行了。 by then是由 by(到……为止)和then(那时)合成的
by that time 到那时;截止那个时候 一般与完成时连用.
We had learned 5000 words by that time when we graduated.
from that time 从那时起=since then 一般与完成时连用.
I have slept late from that time. since that time 自从那个时候起，常与完成时连用
最终答案：略