因為堅持，才會有破繭成蝶這樣美好的故事。為大家準備了以下內(nèi)容，希望對大家有幫助。
1.2022年6月大學(xué)英語四級語法知識
had better表示""
had better 相當于一個助動詞，它只有一種形式，它后面要跟動詞原形。
had better do sth
had better not do sth
It is pretty cold. You'd better put on my coat.
She'd better not play with the dog.
had better have done sth表示與事實相反的結(jié)果，意為"本來"。
You had better have come earlier.
2.2022年6月大學(xué)英語四級語法知識
表示推測的用法
can, could, may, might, must 皆可表示推測，其用法如下：
1)情態(tài)動詞+動詞原形。
表示對現(xiàn)在或?qū)淼那闆r的推測，此時動詞通常為系動詞。
I don't know where she is, she may be in Wuhan.
2)情態(tài)動詞+動詞現(xiàn)在進行時。
表示對現(xiàn)在或?qū)碚谶M行的情況進行推測。
At this moment, our teacher must be correcting our exam papers.
這時，我們老師想必在批改試卷。
3)情態(tài)動詞+動詞完成時。
表示對過去情況的推測。
We would have finished this work by the end of next December.
明年十二月底前我們很可能已完成這項工作了。
The road is wet. It must have rained last night.
地是濕的，昨天晚上一定下雨了。
4)情態(tài)動詞+動詞的現(xiàn)在完成進行時。
表示對過去正在發(fā)生事情的推測。
Your mother must have been looking for you.
媽媽一定一直在找你。
5)推測的否定形式，疑問形式用can't, couldn't表示。
Mike can't have found his car, for he came to work by bus this morning.
邁克一定還沒有找回他的車，因為早上他是坐公共汽車來上班的。
注意：could, might表示推測時不表示時態(tài)，其推測的程度不如can, may。
3.2022年6月大學(xué)英語四級語法知識
情態(tài)動詞+ have +過去分詞
1) may(might) have + done sth, can (could) have + done sth 表示過去，推測過去時間里可能發(fā)生的事情。
Philip may (might) have been hurt seriously in the car accident.
Philip can (could) have been hurt seriously in the car accident.
2) must have +done sth，對過去時間里可能發(fā)生的事情的推測，語氣較強，具有"肯定"，"諒必"的意思。
---Linda has gone to work, but her bicycle is still here.
---She must have gone by bus.
3) ought to have done sth, should have done sth
本應(yīng)該做某事，而事實上并沒有做。否定句表示"不該做某事而做了"。
You ought to (should) have been more careful in this experiment.
He ought not to have thrown the old clothes away.(事實上已扔了。)
ought to 在語氣上比should 要強。
4) needn't have done sth 本沒必要做某事
I dressed very warmly for the trip, but I needn't have done so. The weather was hot.
5) would like to have done sth 本打算做某事
I would like to have read the article, but I was very busy then.
1.2022年6月大學(xué)英語四級語法知識
had better表示""
had better 相當于一個助動詞，它只有一種形式，它后面要跟動詞原形。
had better do sth
had better not do sth
It is pretty cold. You'd better put on my coat.
She'd better not play with the dog.
had better have done sth表示與事實相反的結(jié)果，意為"本來"。
You had better have come earlier.
2.2022年6月大學(xué)英語四級語法知識
表示推測的用法
can, could, may, might, must 皆可表示推測，其用法如下：
1)情態(tài)動詞+動詞原形。
表示對現(xiàn)在或?qū)淼那闆r的推測，此時動詞通常為系動詞。
I don't know where she is, she may be in Wuhan.
2)情態(tài)動詞+動詞現(xiàn)在進行時。
表示對現(xiàn)在或?qū)碚谶M行的情況進行推測。
At this moment, our teacher must be correcting our exam papers.
這時，我們老師想必在批改試卷。
3)情態(tài)動詞+動詞完成時。
表示對過去情況的推測。
We would have finished this work by the end of next December.
明年十二月底前我們很可能已完成這項工作了。
The road is wet. It must have rained last night.
地是濕的，昨天晚上一定下雨了。
4)情態(tài)動詞+動詞的現(xiàn)在完成進行時。
表示對過去正在發(fā)生事情的推測。
Your mother must have been looking for you.
媽媽一定一直在找你。
5)推測的否定形式，疑問形式用can't, couldn't表示。
Mike can't have found his car, for he came to work by bus this morning.
邁克一定還沒有找回他的車，因為早上他是坐公共汽車來上班的。
注意：could, might表示推測時不表示時態(tài)，其推測的程度不如can, may。
3.2022年6月大學(xué)英語四級語法知識
情態(tài)動詞+ have +過去分詞
1) may(might) have + done sth, can (could) have + done sth 表示過去，推測過去時間里可能發(fā)生的事情。
Philip may (might) have been hurt seriously in the car accident.
Philip can (could) have been hurt seriously in the car accident.
2) must have +done sth，對過去時間里可能發(fā)生的事情的推測，語氣較強，具有"肯定"，"諒必"的意思。
---Linda has gone to work, but her bicycle is still here.
---She must have gone by bus.
3) ought to have done sth, should have done sth
本應(yīng)該做某事，而事實上并沒有做。否定句表示"不該做某事而做了"。
You ought to (should) have been more careful in this experiment.
He ought not to have thrown the old clothes away.(事實上已扔了。)
ought to 在語氣上比should 要強。
4) needn't have done sth 本沒必要做某事
I dressed very warmly for the trip, but I needn't have done so. The weather was hot.
5) would like to have done sth 本打算做某事
I would like to have read the article, but I was very busy then.