I. 國中常見的助動詞有：
do, does, did, can, could, may, might, will, would, shall, should, must, need(用於否定句、疑問句), would rather, had better, ought, used(過去常常)




II. 意思：
can：表示能力、表示『懷疑現在的事實』、許可(=may)、能夠、可以
I can drive a car, wash dishes and set the table for dinner.
The old bachelor can’t be my sister’s boyfriend.
You can have a look at my new sports car.
The baby cannot walk yet.
Can you speak English? Yes, I can speak English.
Can I go home? No, you can’t go home.

may：表示允許、可能、也許、願(祝)
May I speak to Amy, please?
May I help you?
You may call him a genius, but you can’t call him a man of character.
If I may say so, you are mistaken.
May you succeed!
It may be true.
Will it rain? Yes, it may rain.
May I go? Yes, you may go.

would：表示決心或意向；會~；願意~；表示「禮貌的請求」；will的過去式
誰會拔除花園的雜草嗎？
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他說他第二天將去看電影。
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請你把你的背包借給我好嗎？
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Would you like some tea?
Would you like to help me?
Would you like to listen to the radio for the news?

should：應該；表示「責任」或「義務」；shall的過去式
你應該愛你的國家。
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你昨晚應該完成你的家庭作業。
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Everyone should be punctual.
You should have seen the film.
They should come by five o'clock, I think.

might：表示猜測(也許、可能)、表示請求
It might rain tomorrow morning.
It might be true.
You might fail if you were lazy.
Might I come in?

must：表示『義務、禁止』
Students must study hard.
You must obey your parents.
You must not go.
Must I go? Yes, you must go. / No, you need not go.




III. 當作助動詞用的：
A. 進行式、被動語態中的be
Are you sleeping, Franco?
Was she bitten on the leg by the big yellow dog? Oh, yes, she was.

B. 完成式中的have, has, had
Have you even been here? No, never. I have never been here.




IV. 助動詞的位置：放在_____________之前。




V. 助動詞注意事項：
A. 除了『do』之外，不受主詞影響：主詞第三人稱單數不必加『s』。

B. 除了『do』之外，其他助動詞在句中均要翻譯。所以，在問句、否定句中，中文裡找不到助動詞，英文就用『do, does, did』。
但是：在肯定句中，『do、does、did』要翻譯，且翻成『務必、真的、的確』
I do open the door, but it’s no use.
Mike did come yesterday, but you weren't home.
他不愛我。(中文裡找不到助動詞) → He doesn't love me.
他愛我嗎？(中文裡找不到助動詞) → Does he love me？




VI. 助動詞有一些沒有過去式：
will / would (否定：won't) 相當片語： __________________
may / might
can / could (否定：can't, cannot)
shall / should
do / did
does / did
must / × (過去式用 ______________) 相當片語： ________________
be / were, was (在___________式及__________式)
have / had (在_________式)




VII. 有一些助動詞的過去式也可用在現在式、或未來式的句子，表示另外一種意思：
It might rain tomorrow. (might 表示：_____________)
We students should study hard. (should 表示：_________)




VIII. 一個句子中，只能使用一個助動詞，其後需以與其相當的『動詞片語』取代：
你將必須付超過一萬美元來購買此種卡車。
You will have to pay more than ten thousand American dollars buying this kind of truck.




IX. should ＋ have ＋ p.p. 表示『過去應該做了...』(可是並沒做)
You should have finished your homework last night, but you didn’t.




X. If ＋ should ...萬一...(表示說話者認為會如此)
Please take care of my daughter if I should die.
If Joseph should fail, he would be very sad.
If Nina should pass the test, her parents would be very happy.
助動詞的過去式，常用於『假設語氣』中，表示願望。




XI. 常見助動詞片語：
would you (please) ＋ V .....
would you mind ＋ Ving .....
would you like ＋ to V .....
would rather ＋ V ＋ than ＋ V ..... = prefer to V rather than V...