下面是小编为大家整理的if当如果讲时引导什么从句，本文共8篇，供大家参考借鉴，希望可以帮助您。本文原稿由网友“hudeying000@126”提供。
篇1：if当如果讲时引导什么从句
if做连词,主要有两个意思,“是否”,引导宾语从句；“如果”,引导状语从句：
一、if作为连词,引导条件状语从句,它表示的意思是“假如”“如果”等.在复合句中如果主句用将 来时,则if引导的状语从句用一般现在时.例如：
1.If itdoesn’train,we will go to the park next Sunday.如果天不下雨,下周星期天我们将去公园.
2.If you ask him,he will help you．如果你求他,
if从句中用过去式,表示不可能实现,大概不会实现或提出作为考虑的.假定条件.此时需要用虚拟语气,例如：
1.If you were a bird,you could fly.假使你是只鸟,你便会飞了.
2.If I asked him(if I were to ask him) for a loan,would he agree?如果我向他借贷,他会答应吗?
另外,if从句中用过去完成式,表示过去未实现的条件(例如由于不可能实现或某人之未能实行).例如：
1.If they had startedearlier,they would have arrivedin time．要是他们早些动身,他们便可及时到达了.
2.If they had not started when they did,they would not be here now．如果他们那时不动身,现在他们就不会在此地了.
二、if还可以引导让步状语从句.这时if当作“即使是”,“虽说”解.例如：
1.If she’s poor,at least she’s honest． 虽说她很穷,但至少她还是诚实的.
2.If I am wrong,you are wrong,too． 即使说我错了,那么你也不对.
3.I’ll do it,even if it takes me all the afternoon． 虽然会花费我一下午的时间,我还是要做这事.
三、if作为连词还可以引导宾语从句.引导宾语从句时和whether意思相同.例如：
1.Lily asked if ／ whether she liked it.莉莉问她是否喜欢它.
2.She asked if ／ whether they had a cotton one． 她问是否他们有一件棉织的.
篇2：if当是否讲时引导什么从句
从句可放在主句前面，此时要用逗号分开，也可放在主句后面。
如：
1.If it doesn't rain tomorrow , we will go shopping .（if it doesn't rain tomorrow是从句）
= We will go shopping if it doesn't rain tomorrow.
如果明天不下雨，我们就去购物。
2.He will come if you invite him. (if you invite him 是从句）
=If you invite him , he will come .
如果你请他,他会来的。
if引导的从句称之为条件状语从句，在句子中作状语。主句用将来时态，而从句用一般现在时。
篇3：if当是否讲引导什么从句
Put your hand up if you need more paper.
若有人还要纸，请举手。
Only time will tell if the treatment has been successful.
只有时间才能证明这种疗法是否成功。
He must be 70 if he's a day!
他至少70岁了！
I don't care if I never see him again!
即使我永远再也见不到他，我也不在乎！
Call me if you have any problems regarding your work.
你如果还有什么工作方面的问题就给我打电话。
篇4：as当随着时引导的是什么从句
My new job is much the same as the old one.
我的新工作和旧工作差不多。
Take as much time as you like.
你想花多少时间就花多少时间。
Research will be needed as a preliminary to taking a decision.
作出决定之前需要进行研究。
This year's results are virtually the same as last year's.
今年的结果几乎和去年的一样。
It's not so easy as you'd think.
不像你想的那么容易。
篇5：if当是否引导什么从句
If I might just say something...
要是叫我说…
What if she forgets to bring it?
要是她忘记带来，会怎么样呢？
'And if I say no?' she ventured.
“那么我要是说不呢？”她试探说。
篇6：so作为所以讲引导什么从句
So you're a runner, huh?
这么说，你是个跑步爱好者喽？
So it's a magic potion?
这么说它是一种魔药？
Sorry I took so long.
对不起，我用了这么长时间。
篇7：if作是否讲引导什么从句
What difference will it make if he knows or not?
他知不知道有什么关系吗？
Please let me know how many are coming, if any.
请告诉我，如果有人要来的.话，有多少？
That was a disaster if ever there was one!
那确实是场灾难！
Put your hand up if you know the answer.
知道答案就举手。
If you love each other, why not get married?
要是你们彼此相爱，干吗不结婚呢？
If you don't believe me, go and see for yourself!
要是不信我说的，你自己去看看！
篇8：as意为随着时引导什么从句
His career is as good as over.
他的事业差不多要完了。
His hair was as white as snow.
他头发雪白。
This isn't as bad as I thought.
这没我原来所想的那么差。
