很多考生在写托福作文的时候经常用举例说明的句型，我们在举例的时候经常说“如果…….“，也就是if...更不用说这个例子的好坏了，就他们自己的句子而言，很多都有问题。下面由新航道的沈阳托福培训小编为您解答！
先看两个例子：
[Scenery]Sue has lost her watch. She think it may be at Ann’s house.
SUE: I think I left my watch at your house. Have you seen it?
(1) ANN: no, but I’ll have a look when I get home. If I find it, I’ll tell you.
If I find…., I’ll……
(2) Ann says: If I found a wallet in the street, I’d take it to the police.
If I found……, I’d(=I would)……..(而不是if Ifind, I’ll…..)
这里的两个句子会有不同的含义，前者说Ann认为她有找到手表的真正概率。所以说iff I find….., I’ll…..
后者是完全不同的情况。安娜在这里没有考虑到真正的概率；在虚拟场景中，她认为自己真的不能在街上挑选手表。所以她说：if I found……,I’d……
if I do……….和if I did...的区别
用if 过去式(if Ifound/if youwere/if wedidn’t等) 表示虚拟的事情，而不是过去发生的事情：
Whatwouldyoudoif youwonamillionpounds?
Idon’t really want to go to their party, but I probably will go. They’dbeoffendedif Ididn’t go
Sarah has decided not to apply for the job. She isn’t really qualified for it, so she probably wouldn’tgetitif sheapplied.
wouldd一般不使用would:
I’dbeveryfrightenedif somebodypointedagunatme.(而非if somebodywouldpoint)
IfIdidn’t go to their party, they’d be offended(而非if Iwouldn’t go)
If …….would可以用来请求某人做某事：
Iwouldbegratefulif youwouldsendmeyourbrochureassoonaspossible.
“Shall I close the door?”“yes,please, Ifyouwould.”
Would(‘d) / wouldn用于句子的主句(不是if从句)
If you took more exercise, you’d(=youwould)probablyfeelhealthier.
Wouldyoumindif Iusedyourphone?
I’m not tired enough to go to bed yet. I wouldn’t sleep.
此外，if引导的条件句也会引起倒装，如果在作文中使用，也是一个加分点：
先看正常的词序.
Itwouldbeaserioussetback,ifthetalksweretofail.
Ifyoushouldneedmoreinformation,pleasetelephoneourmainoffice.
IfAlexhadasked, Iwouldhavebeenabletohelp.
倒装是为了省略if
itwouldbeaserioussetback,werethetalkstofail.
Shouldyouneedmoreinformation,pleasetelephoneourmainoffice.
HadAlexasked, Iwouldhavebeenabletohelp
倒装句比if-从句更正式.
但在否定句中，不能使用缩写
e.g.
Had he not resigned, we should have been forced to sack him(不需要hadnt he…..)
写托福作文的时候，希望大家举例的时候都能写案例。因为案例有其特殊的意义和线条，当然，如果你真的没有经历过，当你举例虚拟场景的时候， if开始时，不要弄错。
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