大家好，今天小编来为大家解答英语语法初探：情态动词这个问题，英语语法初探：情态动词很多人还不知道，现在让我们一起来看看吧！

[上次审查]

英语语法初探：介词

[本期内容]

一、内容概述

二、内容简述

(1)定义

英语中的情态动词是用来表示必要、合意和确定程度的助动词。

(2)基本特征

大多数情态动词的用法有以下特点：

1.它们后面总是跟着动词原形。

2.它的形式不受单复数主语和人称的影响。

3.大多数情态动词只有两种变化形式：一般形式和过去形式。

(三)常见情态动词

下表列出了英语中常见的情态动词：

情绪

动词

使用

示例(现在或将来)

示例(表格过去)

can/could

表能力、许可、要求或可能性。

I can learn modal verbs online.You can use my car tomorrow.Can I borrow your book?Cats can't swim.

I could jump high a few years ago but now I can't.That can't have been true!

have to

表必要性。

I have to go to class today.I don't have to go to class today.

I had to go to class yesterday.I didn't have to go to class yesterday.

have got to

表必要性。

I have got to go to class today

I had to go to class yesterday.

had better

表强烈建议。

You had better be on time.

may

表示许可、请求或委婉的可能性。

May I borrow your book?You may leave the room.He may be at the school.

He may have been at school.

might

表达委婉的可能性。

He might be at school.

He might have been at school.

must

表示非常必要、强制禁止或可能性较大。

I must go to class today.You must not open that door.Mary isn't in class. She must be sick.(present only)

I had to go to class yesterday.Mary must have been sick yesterday.

ought to

强烈建议或更有可能。

I ought to study tonight.She ought to be at school

I ought to have studied last night.She ought to have done well on the test.

shall

用于第一人称表请求。

Shall I invite them too?Shall we dance?

should

强烈建议或更有可能。

I should study tonightHe should be at school

You should have paid your bills.He should have done well on the test.

更多的情态动词

情绪

动词

使用

示例(现在或将来)

示例(表格过去)

be supposed to

表期望。

We are supposed to meet them here.

We were supposed to meet here.

be to

表强烈期望。

We are to meet them here.

We were to meet them here.

would like (to)

表达想法。

I would like to learn English free.

would rather

表格首选项。

I would rather walk than drive.

need

常用于否定句，表格没有必要。

She needn't go there alone.

He needn't have done it.

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