英语语法填空中什么时候用BEFORE,什么时候用UNTIL

1.可以用意思来填
2.until/not until是指：直到什么时候为止...其中非延续性动词用后者，延续性动词用前者。
例句：Not until my father came back did I fell asleep.
I was awake until my father came back.
注意：倒装时倒装主句，从句语序不变。改为强调句时基本语序不变。
before在...之前，常用在时间状语从句中。
常用句型：It is +( )+before...
注意：前后时态要一致，遵从主将从现原则。
翻译：1...就...It was not long before he turned against his country.不久他就背叛了他的祖国。
2...才...It was a long time before he came to himself.很久之后他才恢复意识。

4．before, by, till, until
(1)before指“在……之前”
Please come before ten o’clock.请10点以前来。
The meeting will end after 3:00 p.m. 会议将在下午三点后结束。
表示“在……以前”时，before与by基本可通用。但by还有“截至……为止”之意，此时可与完成时连用，而before一般不与完成时连用。如：
How many models have you made by the end of last month?
截至上月底你做了多少个模型？
(2)by指“不迟于，到……时为止，在……以前”
I must finish my home work by lunch.午饭前我必须做完作业。
We had learned over 1000 words by the end of last term.
到上学期末为止，我们已经学了1000多个单词了。
(3)tell(until)“直到……为止”
You mu