SPECULATION： ‘MIGHT’ 表示推测的might
我们学了对将来的事情不太确定时，可以用might来替换will:
I will see him soon.我很快就要见到他了。
I might see him tomorrow.我明天有可能见到他。
Might还可以放在用would的地方，表示比would 更不确信：
If I won the lottery, I would buy a car.如果我的彩票中奖了，我要买一辆新车。
If I won first prize, I might buy two cars.如果我得了一等奖，我可能买两辆车。
PAST SPECULATION: ‘MUGHT HAVE’ 对过去进行推测的might have
表示对过去推测时，可以用would have, 还可以用might have来代替would have, 不过这时的确信程度更小。
例如下面这种说法：
If I had worked harder at school. I would have passed my exams.如果在学校更努力学习，我就会通过考试了。
表示不怎么确定时，可以这样说：
If I had worked harder at school, I might have passed my exams.如果在学校更努力学习，我也许就能通过考试了。否定句
也一样，例如：
If I had been there, the accident would not have happened.如果我在那儿，事故也许不会发生了。
表示不怎么确定时可以像下面这样说：
MULTI-WORD VERBS： WITH ‘BACK’ back的短语动词
Back有下面几种上意思。
①一个基本意思是“沿着相反的方向，回到出发点”：
He only arrived yesterday, and he is going back tomorrow.他昨天刚来，明天就要回去。
If you have any problem, seed it back to the factory.如果有任何问题，可以寄回厂里。
After you have finished, will you put the books back on the shelves, please?完成之后，请你把这些书放回到书架上好吗？
与此相似的还有“回到跟原来一样的状态上”：
Is John back from his hpolidays yet?约翰度假回来了吗？
-No, he’s coming back tomorrow.没有，他明天回来。
②另一个是“在后面的位置”、“向后”的意思：
Keep back! Don’t go near it. 向后退！ 别靠近！
He first appeared two chapters back.两章之后他才第一次出场。
Tie your hair back-it is safer. 把你的头发所在后面，那样会更安全。
The house stands back from the trees. 房子就在树林后面。
I tried to save her, but they pulled me back.我试着去救她，但是他们把我拉了回来。
Walk away and don’t look back. 走开别回头看。
还有“已经过去的时间”的意思：
I look back on my childhood with sadness.我忧伤地加快着我的童年。
还有“阻止”的意思：
The police kept the crowed back.警察阻止人群靠近。
I want to be successful. Dfon’t hold me back.我想要成功，不要阻拦我！
③第三个基本的意思是“返回”、还回“：
He must pay back the money he borrowed.他必须把借的钱还回来。
She wrote to me and I wrote back.她写信给我，我给她回了信。
④和特定的动词搭配还有特殊的意思：
put back:延期
They have put back the match from May 3rd to May 10th. 他们已经把比赛从5月3日延期到5月10日。
go back on:违背；背弃
He promised me ,but he has gone back on his word/promise.他答应过我，但是他食言了
