情态动词 (Modal Verbs)
情态动词用来表达可能性、能力、建议、请求、义务等。情态动词的结构都很简单，不随主语改变形式，且后接动词原形。以下是每个情态动词的常见用法及例句。
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1. 能力和可能性 (Ability & Possibility): Can / Could
Can 用于表示现在的能力或可能性。
I can speak English. （我会说英语。）
Can you help me? （你能帮我吗？）
Could 是 can 的过去式，用于表达过去的能力或比较礼貌的请求、可能性。
When I was young, I could run very fast. （我年轻时跑得很快。）
Could you pass the salt, please? （请把盐递过来好吗？）
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2. 许可和可能性 (Permission & Possibility): May / Might
May 用来请求允许或表达可能性，较为正式。
May I use your phone? （我可以用你的电话吗？）
It may rain tomorrow. （明天可能会下雨。）
Might 表示不确定性更高的可能性。
Take an umbrella, it might rain later. （带把伞吧，可能会下雨。）
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3. 必要性和义务 (Necessity & Obligation): Must / Have to / Mustn't
Must 表达主观上的“必须”或“有必要”做某事。
You must finish your homework before going out. （你必须完成作业才能出去。）
I must call my mom today. （我今天一定要打电话给我妈妈。）
Have to 表达客观上的必要性，指因为外界条件而“不得不”做某事。
We have to wear uniforms at school. （我们必须穿校服。）
Mustn't 表达禁止或绝对不能做某事。
You mustn't smoke here. （你不能在这里抽烟。）
注意：don't have to 的意思是“可以不做”而不是“不允许做”，例如：
You don't have to go if you don't want to. （如果你不想去，可以不去。）
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4. 建议和劝告 (Advice & Suggestions): Should / Shouldn't / Ought to
Should 用于提出建议或表达认为某事是对的。
You should eat more vegetables. （你应该多吃蔬菜。）
Should we invite her to the party? （我们应该邀请她参加派对吗？）
Shouldn't 表示不建议或认为某事不好。
You shouldn't eat too much sugar. （你不应该吃太多糖。）
Ought to 类似于 should，用于建议或道德上的责任。
You ought to apologize to her. （你应该向她道歉。）
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5. 提供和邀请 (Offers & Invitations): Shall
Shall 常用于第一人称，表示建议、提供帮助、或征求意见，主要在英式英语中使用。
Shall we go to the movies? （我们去看电影好吗？）
Shall I open the window? （我来开窗户好吗？）
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6. 意愿和意图 (Willingness & Intention): Will / Would
Will 表示未来的意愿、计划或决定。
I will call you tomorrow. （我明天会打电话给你。）
Will you come to the party? （你会来参加派对吗？）
When I was young, I would often go fishing with my dad. （我小时候常和爸爸去钓鱼。）
Would you like some coffee? （你想喝点咖啡吗？）
Would 是 will 的过去式，表示过去的意愿或礼貌请求。
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其他细节总结
Should / Shouldn't
You should try to sleep more. （你应该多睡一点。）
We shouldn't spend all our money. （我们不应该把钱花光。）
用于建议或提出好的/坏的主意：
Have to / Don't have to
You don't have to come if you are busy. （如果你忙，可以不来。）
I have to go to work every day. （我必须每天去上班。）
Have to 表示外界条件带来的“必须”。
Don't have to 表示没有必要。
Modals 常见的时间标志词：Yesterday, last night, last week, a month ago等，通常与过去时配合使用。
歌词
(Music)
Woo, I want to hang out
Uh-huh, with my friends until...
...until 9.
Until 9?
Yeah, until 9!
Oh, that’s just fine, fine, fine.
You don’t have to tidy up your room,
You don’t have to help your dad,
And you don’t have to do your homework.
Oh, really, Mom? That’s not bad!
But you have to be home by 8,
And you really mustn’t be late,
And you mustn’t complain, dear James.
No tablet tonight, and no games.
I was kidding, Mom, and that’s true!
I have finished what I have to do.
Why don’t you go and check it out?
(Music)
Yeah, but please hurry up,
I’d like to go out!
We use “don’t have to” when we want to say
That something’s not necessary.
Your room is clean,
It’s not necessary to tidy it up.
You don’t have to tidy up your room.
We use “must” to say “Don’t do it.”
I’m telling you not to do it.
It’s dark outside, don’t be late!
You mustn’t be late!
