基礎英文文法 看影片學英文

英文基礎文法-Lesson 42《情態助動詞》

aux verb

情態助動詞

置於主要動詞之前,它幫助主要動詞來表達能力、意願、請求、許可、命令、客氣、義務、責任、告誡、或猜測(可能性)等各種不同的語氣或態度。情態助動詞有:can、could、may、might、must、ought to、shall、should、will、would

情態助動詞否定:cannot、could not、may not、might not、must not、ought not to、shall not、should not、will not、would not

情態助動詞的用法

can

有能力(能,會); 允許(可以,能);請求(能,可以); 可能性

They can ride a bike.

You can go home now.

Can we join you?

could

有能力(能,會); 請求; 建議; 應該;猜測

You could go home now.

You could choose Sat­ur­day for swimming.

may

允許(可以,能); 祝願; 猜測

You may come back now.

might

可能、可以;請求; 猜測

I might be late today.

He might be angry if you say that to him.

must

責任、義務(必須, 非…不可);告誡;命令(一定要); 猜測

You must turn off the light when you leave.

ought to

責任或義務(應該,應當); 可能性

You ought to turn off the light when you leave.

shall

建議

You shall let me know.

should

責任(應該,應當);可能性

You should turn off the TV before dinner.

will

命令(應該); 可能; 願意

I will be home by 8.

would

要求;希望; 願意

I would be home by 8.

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