1) If you ask him,he will help you.
如果你请他帮忙,他会帮你的。
2) If you fail in the exam,you will let him down.
如果你考试不及格,你会让他失望的
转为We will stop playing if it rains.
if引导的条件状语从句
1、unless conj.除非,若不,除非在……的时候
You will fail to arrive there in time unless you start earlier.如果你不早点动身,你就不能及时赶到那儿。
Unless it rains,the game will be played.除非下雨,比赛将照常进行。
2、on condition(that)...在……条件下,如果 on condition (that)...引导的条件从句是主句事件发生的前提条件或唯一条件。
I can tell you the truth on condition that you promise to keep a secret.我可以告诉你真相,条件是你答应保密。
You can go swimming on condition (that) you don't go too far from the river bank.你只有在不远离河岸的条件下才可以下水游泳。
3、supposing conj.如果,假如 supposing引导的条件从句表示一种假设条件。
Supposing it rains,shall we continue the sports meeting?倘若下雨,我们的运动会还要继续举行吗?
Supposing anything should go wrong,what would you do then?假如出了什么问题,你准备怎么对付?
4、provided conj.假如,除非,以……为条件 provided (that) +从句表示一种假设条件。
He will sign the contract provided we offer more favorable terms.如果我们提出更优惠的条件,他就会在合同上签字。
He won't be against us in the meeting provided that we ask for his advice in advance.如果我们提前征求一下他的意见,他就不会在会上反对我们。
But for the rain,we should have a pleasant journey.
要不是下雨,我们的旅行肯定会很愉快。
But for your help,we should not have finished in time.
要不是你帮忙,我们肯定不能及时完成任务
条件状语用法编辑
unless = if...not
e.g. Let's go out for a walk unless you are too tired.
So long as you’re happy,it doesn’t matter what you do.
只要你高兴,你做什么都没有关系。
You may borrow my book as long as you keep it clean.
只要你保持书的清洁,你就可以把我的书借去。
Take your umbrella in case it rains.
带着你的伞吧,以防下雨。
You can't learn English well unless you work hard.
除非你努力学习,否则你学不好英语。
You can use my bike on condition that you return it by Friday.
你可以使用我的自行车,条件是你星期五以前还。
I will come to see you if I have time.
我有时间,我就来看你。
If the rain stops,I shall go out for a walk.
如果雨停了,我就出去散步。
If I were to I should first of all get the experts to discuss the plan.
如果我真的想做这事,我首先会找专家们讨论我的计划。