if + 句子，句子 这样的句型是什么意思？
真实条件句用于陈述语气，假设的情况可能发生，其中 if 是如果的意思。
时态关系
句型： 条件从句 主句
一般现在时 shall/will + 动词原形
If he comes, he will bring his violin.
典型例题
The volleyball match will be put off if it ___.
A. will rain B. rains C. rained D. is rained
答案B。真实条件句主句为将来时，从句用一般现在时。
注意：
1） 在真实条件句中，主句不能用be going to表示将来，该用shall, will.
(错) If you leave now, you are never going to regret it.
(对) If you leave now, you will never regret it.
2） 表示真理时，主句谓语动词便不用shall (will) +动词原形，而直接用一般现在时的动词形式。
16.2 非真实条件句
1）时态：可以表示过去，现在和将来的情况。它的基本特点是时态退后。
a. 同现在事实相反的假设。
句型 ： 条件从句 主句
一般过去时 should( would) +动词原形
If they were here, they would help you.
b. 表示于过去事实相反的假设。
句型： 条件从句 主句
过去完成时 should(would) have+ 过去分词
If she had worked harder, she would have succeeded.
The rice would not have been burnt if you had been more careful.
If my lawyer had been here last Saturday, he would have prevented me from going.
If he had come yesterday, I should / would have told him about it.
含义：He did not come yesterday, so I did not tell him about it.
If he had not been ill and missed many classes, he would have made greater progress.
含义： He was ill and missed many lessons, so he did not make greater progress.
c. 表示对将来的假想
句型： 条件从句 主句
一般过去时 should+ 动词原形
were+ 不定式 would + 动词原形
should+ 动词原形
If you succeeded, everything would be all right.
If you should succeed, everything would be all right.
If you were to succeed, everything would be all right.
16.3 混合条件句
主句与从句的动作发生在不同的时间，这时主，从句谓语动词的虚拟语气形式因时间不同而不同，这叫做混合条件句。
If you had asked him yesterday, you would know what to do now.
（从句与过去事实相反，主句与现在事实相反。）
If it had rained last night (过去), it would be very cold today (现在).
16.4 虚拟条件句的倒装
虚拟条件句的从句部分如果含有were, should, 或had, 可将if省略，再把were, should或had 移到从句句首，实行倒装。
Were they here now, they could help us.
=If they were here now, they could help us.
Had you come earlier, you would have met him
=If you had come earlier, you would have met him.
Should it rain, the crops would be saved.
=Were it to rain, the crops would be saved.
注意：
在虚拟语气的从句中，动词’be’的过去时态一律用"were"，不用was， 即在从句中be用were代替。
If I were you, I would go to look for him.
如果我是你，就会去找他。
If he were here, everything would be all right.
如果他在这儿，一切都会好的。
典型例题
_____ to do the work, I should do it some other day.
A. If were I B. I were C. Were I D. Was I
答案C. 在虚拟条件状语中如果有were, should, had这三个词，通常将if省略，主语提前, 变成 were, should, had +主语的形式。但要注意，在虚拟条件状语从句中，省略连词的倒装形式的句首不能用动词的缩略形式。如我们可说 Were I not to do., 而不能说 Weren’t I to do.
16.5 特殊的虚拟语气词：should
1） It is demanded / necessary / a pity + that…结构中的主语从句的谓语动词要用should 加动词原形， should 可省略。
句型：
(1)suggested
It is (2)important that…+ (should) do
(3) a pity
(1)suggested, ordered, proposed, required, demanded, requested, insisted； + (should) do
(2)important, necessary, natural, strange
a pity, a shame, no wonder
(3)It is suggested that we (should) hold a meeting next week.
It is necessary that he (should) come to our meeting tomorrow.
2）在宾语从句中的应用
在表示命令、建议、要求等一类动词后面的从句中。
order, suggest, propose, require, demand, request, insist, command, insist + (should) do
I suggest that we (should) hold a meeting next week.
He insisted that he (should ) be sent there.
注意： 如suggest, insist不表示"建议" 或"坚持要某人做某事时"，即它们用于其本意"暗示、表明"、"坚持认为"时，宾语从句用陈述语气。
The guard at gate insisted that everybody obey the rules.
判断改错:
（错） You pale face suggests that you (should) be ill.
(对) Your pale face suggests that you are ill.
(错) I insisted that you ( should) be wrong.
(对) I insisted that you were wrong.
3）在表语从句，同位语从句中的应用
在suggestion, proposal, idea, plan, order, advice等名词后面的表语从句、同位语从句中要用虚拟语气，即（should）+动词原形。
My idea is that we (should) get more people to attend the conference.
I make a proposal that we (should) hold a meeting next week.
谢谢你给我发信息，希望你能满意。
will [简明英汉词典]
n.意志, 决心, 意向, 遗嘱
v.aux.将, 愿意, 必须
第一个if的句子不是用将来时，而只是想要的意思。不是将来时.
其他的讲解楼上的几位对了
第一句我明白了，应该是，如果你总是把它放在心上，你就会一直担心下去。第二句的意思应该是，如果你跟不上节奏，那么你就得出局。
第一句可以参考http://www.singcuccu.com/index/singcuccu/comments/2816/
if it's on your mind,it's probably not getting down.
So says David Allen in Ready for Anything: 52 Productivity Principles for Work and Life (page 26). At the Chicago GTD | Roadmap seminar, he also said that “your mind is for having ideas, not holding them.”
I remain astonished at all of the half-baked ideas, assorted ephemera, myriad widgets, nearly useless crap, and occasional flashes of brilliance that daily comes out of my head and onto my notebook or into the voice recorder. On the one hand, it means that I’m not dead yet. On the other hand, how was I managing before I started to write everything down?
GTDers know the answer to that question: not very well. Here’s David Allen again:
Many years ago, I decided that either your head is the place to hold something or it’s not. How can you intellectually justify halfway in between? And though most people, when they think about it, would say, “No, your head is probably not the best place to keep something in a trustworthy fashion,” they still keep over half their life there. A ton of woulds, coulds, shoulds, need-tos, ought-tos, and might-want-tos would be jammed into one place.
Left only in the mind, these self-commitments create infinite loops that make no progress and produce inner conflict and stress. As soon as you make any sort of commitment with yourself, not completed in the moment, your mind will demand and take psychic energy until it’s resolved. That is mental karma. “I need milk” and “I need to decide whether to buy this company” both tie up space in psychic RAM.
The solution is simple. Write it down. Look at it. Do it or say to yourself, “Not now.” And trust that you’ll see the option again whenever you need to reassess. Give it to a system superior to your mind, so your mental energy can move on to bigger and better work. (page 27)
I’ve written a lot of things down since that seminar. Some of them are:
Take scissors out of purse [before air travel].
Show Mr. Cuccu that house I really like.
Take vitamins.
Clean out purse.
Call Maverick.
Complete car pool log.
Buy two more SpaceGlider units.
Check air pressure in tires.
Show Marina my ING Direct setup.
It’s just as likely that something will end on on my Someday/Maybe list:
Explore that business idea.
Read Nouwen.
Read Kirkegaard.
Replace glass in picture frame.
Contact Marie [my mother].
Contact Sue [my ex-stepmother].
Most days I have nearly a full page of notes to process by the end of the day. Some of it is stuff that comes up during the day, but a good portion of it is stuff that’s been floating around in my head a while. There’s no sign of abatement. In my case, “mind sweep” is a misnomer. It’s more like hiring a storage facility.
哈哈，没有人这么造句的。
if you don't take bus, you will be late for the meeting.
如果你不坐公交车的话，你就会赶不上那个会议的。
斐店安内： 这两个句子应该不是难在句型上,而是难在一词多意. 第一句我明白了,应该是,如果你总是把它放在心上,你就会一直担心下去.第二句的意思应该是,如果你跟不上节奏,那么你就得出局. 第一句可以参考http://www.singcuccu.com/index/...
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