if开头的句子应该用什么时态
If 可导宾语表示“是否”义，也可以引导条件状语从句表示“如果”的含你要问时态的话那就要搞清楚它在引导条件状语从句时所用的虚拟语气的问题了。
a. 与现在事实相反的假设 条件从句 主句一般过去时（be用were） should（would）等 +动词原形 例如：If they were here, they would help you. 如果他们在这儿，会帮助你的。
含义：They are not here, they can’t help you. b. 与过去事实相反的假设 条件从句 主句 过去完成时 should（would）等+ have+ 过去分词 例如：If he had come yesterday, I should \\\/ would have told him about it.如果他昨天来的话，我会把这件事告诉他的。
含义：He did not come yesterday, so I did not tell him about it.c. 表示对将来不大可能发生的事情的假想 条件从句 主句 一般过去时 should\\\/would等 + 动词原形 were+ 不定式 should+ 动词原形 例如：If you succeeded, everything would be all right. 如果你将来成功了，一切都会好的。
If you should succeed, everything would be all right.If you were to succeed, everything would be all right.含义：You are not likely to succeed, everything will be what it is now.
If 开头的句子 改为倒装句怎么改
谢谢
if you have a dream ,you can win.if you work hard ,you can be the first.if you love me ,please tell me.if you go outside ,please turn off the lights.if you are happy ,let me know.
用If开头，帮忙翻译一个句子~~如果每个人能put our mind on our enviroment..那么我们的生活会变得更好。
If everyone can put our mind on our enviroment,then our life will be better.如果每个人都能把注意力集中在我们的环境上,那么我们的生活会变得更好。
