Tom,do you want to go shopping with me today?Sorry,Mum.But only if I ( )my homework ( ) with you A will finish ;will go B would finish ;I go C finish ;will I goD finish ; would go 选C .为什么我看到ONLY 所以肯定用倒装.

Tom,do you want to go shopping with me today?Sorry,Mum.But only if I ( )my homework ( ) with you A will finish ;will go B would finish ;I go C finish ;will I goD finish ; would go 选C .为什么我看到ONLY 所以肯定用倒装.
Tom,do you want to go shopping with me today?
Sorry,Mum.But only if I ( )my homework ( ) with you
A will finish ;will go
B would finish ;I go
C finish ;will I go
D finish ; would go
选C .为什么
我看到ONLY 所以肯定用倒装.

Tom,do you want to go shopping with me today?Sorry,Mum.But only if I ( )my homework ( ) with you A will finish ;will go B would finish ;I go C finish ;will I goD finish ; would go 选C .为什么我看到ONLY 所以肯定用倒装.
解释：
1. 不是有only的句子就必须倒装的,相关语法规定如下：
如果if引导句子的状语或状语从句并提前至句首时,此时句子或主句才能使用部分倒装.
如果if引导的不是句子的状语（从句）,或if结构并没有提前至句首,则无须倒装.
如：Only in this way can you solve the problem.
= You can solve the problem only in this way.
Only when it rains do I take a bus to school.
= I take a bus to school only when it rains.
但是：Only he knows the truth. 该句only修饰句子主语he,所以句子无须倒装.
2. 部分倒装的变化很简单,它类似于把句子变为一般疑问句,只要把该句的be动词/助动词/情态动词提前即可.
该题变化如下：I will go with you only if I finish my homework.
= Only if I finish my homework will I go with you.
所以正确答案为C.
3. A项错在if从句时态有误,if从句应该遵循“主将从现”原则即必须采用一般现在时才对；
B项的if从句用了虚拟语气,但是主句既没有有虚拟语气,也没有部分倒装；
D项错在虽然主句采用了虚拟语气,但是if从句并没有使用虚拟语气,缺乏对应,除非把finish改成finished等还差不多.

用排除法，AD的主句里面没有主语，而且A里面will finish时态绝对是错的，所以只有选B或C；
B后面的I go绝对是错的，所以只能选C
语法的话个人讲不太清楚，就不误人子弟了~

only if 只要。。。。就。。。。。
条件状语从句，主将从现

1 if 如果 引导条件状语从句 主将从现
(也有例外 If you will drive home,be more careful. 如果你非得开车回家，一定多加小心）
2 only 引导状语从句在句首 主句部分倒装 修饰主语时不倒
only in this way can we succeed.
only when he c...

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1 if 如果 引导条件状语从句 主将从现
(也有例外 If you will drive home,be more careful. 如果你非得开车回家，一定多加小心）
2 only 引导状语从句在句首 主句部分倒装 修饰主语时不倒
only in this way can we succeed.
only when he comes back can the children go out.
only you can have access to the file.

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