I don’t really want to go to their party， but I probably will go. They’d be offended if I didn’t go
Sarah has decided not to apply for the job. She isn’t really qualified for it， so she probably wouldn’t get it if she applied.
If從句中一般不用would：
I’d be very frightened if somebody pointed a gun at me.（而非if somebody would point）
If I didn’t go to their party， they’d be offended（而非if I wouldn’t go）
If …….would可以表示用來請(qǐng)求某人做某事：
I would be grateful if you would send me your brochure as soon as possible.
“Shall I close the door？” “yes， please， If you would.”
Would（‘d） / wouldn’t用于句子的主句（不是if從句）
If you took more exercise， you’d （=you would） probably feel healthier.
Would you mind if I used your phone？
I’m not tired enough to go to bed yet. I wouldn’t sleep.
另外，if引導(dǎo)的條件句也能引起倒裝，如果要是在作文里用到，也是一個(gè)加分點(diǎn)：
先看正常語序。
It would be a serious setback， if the talks were to fail.
If you should need more information， please telephone our main office.
If Alex had asked， I would have been able to help.
倒裝是要省略if
it would be a serious setback， were the talks to fail.
Should you need more information， please telephone our main office.
Had Alex asked， I would have been able to help
倒裝句比if-從句更加正式。
但是在否定句里面，不可以用縮寫
e.g.
Had he not resigned， we should have been forced to sack him（不用hadn’t he…。.）
再多說一下，在寫作文的時(shí)候，希望大家舉例的時(shí)候能夠?qū)憣?shí)例，因?yàn)閷?shí)例有它的特指性和行，當(dāng)然，如果實(shí)在你沒有經(jīng)歷過，在舉例虛擬一個(gè)場(chǎng)景的時(shí)候， if起頭，就不要弄錯(cuò)了。
最后幾天， 練練作文， good luck， I give my best bless to all you guys！