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When
Grammar
Adverbial Clauses of Time
________ you were enjoying your trip, I was busy preparing for my exams.
I’d like you to meet him with me ________ he arrives.
Would you help me make a plan to explore Beijing _________ he comes?
_______ they were exploring happily, more and more people came to the square.
He didn’t raise his head ________ someone called him.
_____________ the three boys saw each other, they all jumped around happily.
While
when
before
As
until
As soon as
Adverbial clauses of time 时间状语从句
Tips
as soon as， 表示语句的动作紧接着从句的动作而发生。如：I will give him the message as soon as I see him. (我一看到他，就告诉他这个消息。)
“not … until…” 与“until”：前者表示“直到……才……”，指主句的动作在从句所表示的时间才开始，谓语一般用非延续性动词；而后者则表示主句的动作在从句所表示的时间之前就开始，并且一直持续到该时间为止，其谓语一般用持续性动词。
“主将从现”：即主句用一般将来时态，从句只能用一般现在时。
从句的位置： 时间状语从句放在主句之前或之后均可。但在主句之前时，应用逗号与主句分开。
Functions
be
That would _____ very interesting.
It can _____ one million people.
Tian’anmen Rostrum is _____________ Tian’anmen Square
I can’t _______ to see it.
It’s about one and a half hours _____ bike.
by
in the north of