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什么是 'Can', 'May' 和 'Should'?
'Can'、'May' 和 'Should' 是情态动词，它们在语法上类似，但表达不同的含义。
Can
'Can' 用来谈论能力。它的形式对所有人称都一样，并且总是与动词的原形一起使用。看看这些例子：
I can ride a bicycle.
我会骑自行车。
'Can' 用来谈论能力。
She can paint beautiful pictures.
她会画美丽的画。
'Can' 对所有主语的形式都一样。
They can drive.
他们会开车。
May
'May' 表示可能性。和 'Can' 一样，它对所有人称的形式都相同，并且总是与动词的原形一起使用。以下是一些例子：
It may rain this afternoon.
今天下午可能会下雨。
She may arrive soon.
她可能很快就到了。
Should
'Should' 表示义务和责任，它的形式对所有人称都一样，并且总是与动词的原形一起使用。
You should stay here.
你应该待在这里。
Students should complete their homework on time.
学生应该按时完成作业。
疑问句
要使用这些情态动词构成疑问句，将它们移到句首，主语和主要动词的原形跟在其后。例如：
Can you drive?
你会开车吗？
Should I call the doctor?
我应该给医生打电话吗？
否定句
要用这些情态动词构成否定句，只需在它们后面加上 'not'，然后加上主要动词。以下是一些例子：
I cannot run that fast.
我跑不了那么快。
I may not see you tomorrow.
我明天可能见不到你了。
You should not do that.
你不应该那样做。
注意！
情态动词不能与 'do/does/did' 或 'be' 动词在同一个句子中使用。
They do may come to the party.
他们做可能会来参加聚会。
I am can run very fast.
我可以是跑得很快。
She does should sit down.
她做应该坐下。
Quiz:
Which sentence uses a modal verb to show ability?
She may arrive by noon.
He can swim across the lake.
You should call your teacher.
I will not to go to the store.
Which sentence expresses a possibility?
I should visit my grandmother this weekend.
It may snow tomorrow.
You can finish this task later.
They may not to be late.
Match each sentence with the function of its modal verb.
Sort the words to ask about an obligation.
Complete the sentences with the correct modal verb.
You
leave the room until the meeting ends.
He
play the guitar very well.
She
arrive late to the party.
You
help your friends when they needs it.
I
walk to the store alone.
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