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用所给动词的正确的时态完成句子。
1. Your
cousin will be a government official by the time he ______ (be) thirty. 答案：is.
2. I don’t
know if the musician will get married to the politician as they have planned
but if they _____ (do) I will let you know. 答案：do.
3. the coach
won’t forgive the gymnast unless she _____ (tell) him the truth. 答案：tells.
4. It will
be centuries before this idea _____ true.(come) 答案：comes.
5. Mother
told me not to go to the cinema until I _____ (do) my lessons. 答案：had done.
考点突破之重点精讲三“引导状语从句的before和since及引导强调句型的that的用法辨析”
What a
splendid evening we have had together! It’s a fortnight_______I ebjoyed myself
so much.
A. when B.
that C. before D. since
答案：D。句意为“我们在一起度过了一个多么美好的夜晚啊！ 我已有两周没有这样开心地玩过了。”since引导时间状语从句时，表示“自从……以来”，符合本题的语境。
主句为“it + be动词 + 一段时间”这一结构时，后边的连词该用before，since还是that的问题。
解决这个问题的关键是看主句中的时态和整个主从句的意思。分为三种情况：
1. 如果表示两件事情的发生相隔时间之长或之短，常用before引导从句。它德的特点是：主句常是现在将来时、过去将来时或一般过去时。若主句采用一般过去时的时候，表一段时间的名词后无ago这个词。
It will be a
fortnight before the new director takes charge.要过两周以后新主任才上任。
The expert
said that it would not be long before robots replaced humans.那专家说要不了多久机器人会代替了人的。
Hurricane
hit the area badly. It was long before the area became normal.飓风严重袭击该地区。过了很久以后，该地区才恢复了正常。
2. 如果主句是一般现在或现在完成时，连词常用since，它表示过去某一动作的发生离现在有多长时间了。
It is/has
been centuries since the great wall came into being.自从长城形成到现在已经数个世纪了。
3. 若主句采用过去时态，且表一段时间的词后有ago这个词时，属强调句型，连词要用that.
It was
centuries ago that the Great Wall came into being.是在数个世纪以前长城形成的。
趁热打铁-----学生练习 用beforethat或since填空。
★★★★第二讲：地点状语从句★★★★
地点状语从句常用where wherever everywhere等连词引导；
I found my
books where I left them.我在我放书的地方找到了我的书。
Where there
is a will there is a way. 有志者，事竟成。
Everywhere
they went they were warmly welcomed. 他们去每个地方，他们都受到热烈地欢迎。
They went
wherever they could find work..无论他们在哪里能找到工作，他们就去哪里。
Wherever he
is \may be he must be found.无论他在哪里，他都会被发现。
注意不要和where引导的定语从句相混淆。
We shall go
where working conditions are difficult.哪里工作条件艰苦，我们就去哪里。
We shall go
to the place where work conditions are difficult.我们将去那工作条件艰苦的地方。
三星难点注意：地点状语从句也可以采取无动词分句结构。
Chang the
form where necessary.
Wherever
possible all moving parts should be tested.
Wherever feasible the illustrations have been
taken from standard literature.
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