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MODAL
必須；一定要
You use must to indicate that you think it is very important or necessary for something to happen. You use must not or mustn't to indicate that you think it is very important or necessary for something not to happen.
例句
What you wear should be stylish and clean, and must definitely fit well...
你的穿著應該整潔漂亮，而且必須非常合身。
You are going to have to take a certain amount of criticism, but you must cope with it...
你肯定會遭到一些批評，但你必須去面對。
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MODAL
(通常因為規定或法律)必須，應當
You use must to indicate that it is necessary for something to happen, usually because of a rule or law.
例句
Candidates must satisfy the general conditions for admission...
候選人必須滿足參選的總體條件。
Mr Allen must pay Mr Farnham's legal costs...
艾倫先生應當支付法納姆先生的訴訟費。
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MODAL
(用于表示肯定推測)一定，諒必
You use must to indicate that you are fairly sure that something is the case.
例句
At 29 Russell must be one of the youngest ever Wembley referees...
29歲的拉賽爾一定是有史以來溫布利球場上的裁判員中最年輕的一個。
Reggae must be the only music that's got its own country — Jamaica...
雷蓋音樂得到了一整個國家人民的支持，這個國家就是牙買加——這一點上它無疑是獨一無二的。
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MODAL
(用于表示據已知情況推測)很可能是，想必是，肯定是
You use must, or must have with a past participle, to indicate that you believe that something is the case, because of the available evidence.
例句
'You must be Emma,' said the visitor...
來客說：“你肯定是埃瑪。”
Miss Holloway had a weak heart. She must have had a heart attack...
霍洛韋小姐心臟不好，她肯定得過心臟病。
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MODAL
(用于表示前者為后者的前提)應該已經(發生)
If you say that one thing must have happened in order for something else to happen, you mean that it is necessary for the first thing to have happened before the second thing can happen.
例句
In order to take that job, you must have left another job...
為得到那份工作，你肯定已辭去了另一份工作。
In order to start reading this book you must have had some idea that the physical symptoms you were experiencing were due to anxiety.
開始讀這本書之前，你一定已經了解到：你身體的不適癥狀是源于焦慮。
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MODAL
(用于表示意圖)一定要，堅持要
You use must to express your intention to do something.
例句
I must be getting back...
我一定要回來。
I must have a whiskey...
我要喝杯威士忌。
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MODAL
(用于表示建議或邀請)務必，一定要
You use must to make suggestions or invitations very forcefully.
例句
You must see a doctor, Frederick...
弗雷德里克，你一定得去看醫生。
You must see the painting Paul has given me as a wedding present...
你一定要看看保羅送給我作結婚禮物的那幅畫。
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MODAL
(用于表示同情)必定，想必
You use must in remarks and comments where you are expressing sympathy.
例句
This must be a very difficult job for you...
對你來說，這份工作想必很難。
You must be very worried by now...
你現在一定非常擔心。
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MODAL
(用于強調)我得說/我得承認
You use must in conversation in expressions such as 'I must say' and 'I must admit' in order to emphasize a point that you are making.
例句
This came as a surprise, I must say...
我得說這真是個意外。
I must admit I like looking feminine...
我得承認我喜歡看起來淑女一些。
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MODAL
(用于引起讀者或聽眾的注意)一定要注意/一定記住
You use must in expressions such as 'it must be noted' and 'it must be remembered' in order to draw the reader's or listener's attention to what you are about to say.
例句
It must be noted, however, that not all British and American officers carried out orders...
然而，一定要注意不是所有的英國和美國軍官都執行了命令。
It must be stated that this illness is one of the most complex conditions known to man.
必須聲明，這種疾病是人類已知的最為復雜的疾病之一。
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MODAL
(用于問句中表示生氣)偏偏，非要
You use must in questions to express your anger or irritation about something that someone has done, usually because you do not understand their behaviour.
例句
Why must you do everything as if you have to win?...
你為什么做每件事情都跟你非要贏似的？
Why must she inter-rupt?...
她為什么非要插嘴？
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MODAL
(用于感嘆句，表示驚訝或震驚)一定是，準是
You use must in exclamations to express surprise or shock.
例句
'Go! Please go.' — 'You must be joking!'...
“走吧！請走吧。”——“你一定是在開玩笑吧！”
I really must be quite mad!...
真的，我一定是氣壞了！
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N-COUNT
必不可少的事物;一定要做的事
If you refer to something as a must, you mean that it is absolutely necessary.
例句
The new 37th issue of National Savings Certificates is a must for any taxpayer...
新發行的第37期國家儲蓄債券是任何一個納稅人的必然之選。
A must is a visit to the fascinating and world-renowned Motor Museum.
一定要去參觀一下那個舉世聞名且精彩有趣的汽車博物館。
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PHRASE
如果你一定要(這樣做的話)
You say 'if you must' when you know that you cannot stop someone doing something that you think is wrong or stupid.
例句
If you must be in the sunlight, use the strongest filter cream you can get...
如果一定要呆在太陽底下的話，就擦上你能買到的防曬系數最高的防曬霜。
'Could I have a word?' — 'Oh dear, if you must.'...
“我能說一句嗎？”——“親愛的，如果你非說不可的話，好吧。”
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PHRASE
如果你一定想要知道的話
You say 'if you must know' when you tell someone something that you did not want them to know and you want to suggest that you think they were wrong to ask you about it.
例句
'Why don't you wear your jogging shorts Mum?' — 'Well, my legs are too skinny, if you must know.'
“媽媽，為什么不穿你的慢跑短褲呢？”——“哦，如果你非要問的話，因為我的腿太瘦了。”
'You told him you'd been there that night.' — 'If you must know, yes.'
“你跟他說過你那天夜里去過那兒了。”——“是的，如果你非要問的話。”