SPECULATION： ‘MIGHT’ 表示推測的might
我們學了對將來的事情不太確定時，可以用might來替換will:
I will see him soon.我很快就要見到他了。
I might see him tomorrow.我明天有可能見到他。
Might還可以放在用would的地方，表示比would 更不確信：
If I won the lottery, I would buy a car.如果我的彩票中獎了，我要買一輛新車。
If I won first prize, I might buy two cars.如果我得了一等獎，我可能買兩輛車。
PAST SPECULATION: ‘MUGHT HAVE’ 對過去進行推測的might have
表示對過去推測時，可以用would have, 還可以用might have來代替would have, 不過這時的確信程度更小。
例如下面這種說法：
If I had worked harder at school. I would have passed my exams.如果在學校更努力學習，我就會通過考試了。
表示不怎么確定時，可以這樣說：
If I had worked harder at school, I might have passed my exams.如果在學校更努力學習，我也許就能通過考試了。否定句
也一樣，例如：
If I had been there, the accident would not have happened.如果我在那兒，事故也許不會發生了。
表示不怎么確定時可以像下面這樣說：
MULTI-WORD VERBS： WITH ‘BACK’ back的短語動詞
Back有下面幾種上意思。
①一個基本意思是“沿著相反的方向，回到出發點”：
He only arrived yesterday, and he is going back tomorrow.他昨天剛來，明天就要回去。
If you have any problem, seed it back to the factory.如果有任何問題，可以寄回廠里。
After you have finished, will you put the books back on the shelves, please?完成之后，請你把這些書放回到書架上好嗎？
與此相似的還有“回到跟原來一樣的狀態上”：
Is John back from his hpolidays yet?約翰度假回來了嗎？
-No, he’s coming back tomorrow.沒有，他明天回來。
②另一個是“在后面的位置”、“向后”的意思：
Keep back! Don’t go near it. 向后退！ 別靠近！
He first appeared two chapters back.兩章之后他才第一次出場。
Tie your hair back-it is safer. 把你的頭發所在后面，那樣會更安全。
The house stands back from the trees. 房子就在樹林后面。
I tried to save her, but they pulled me back.我試著去救她，但是他們把我拉了回來。
Walk away and don’t look back. 走開別回頭看。
還有“已經過去的時間”的意思：
I look back on my childhood with sadness.我憂傷地加快著我的童年。
還有“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，不要阻攔我！
③第三個基本的意思是“返回”、還回“：
He must pay back the money he borrowed.他必須把借的錢還回來。
She wrote to me and I wrote back.她寫信給我，我給她回了信。
④和特定的動詞搭配還有特殊的意思：
put back:延期
They have put back the match from May 3rd to May 10th. 他們已經把比賽從5月3日延期到5月10日。
go back on:違背；背棄
He promised me ,but he has gone back on his word/promise.他答應過我，但是他食言了
