Come in, Amy.
Shut the door, please.
This bedroom is very untidy.
What must I do, Mrs. Jones?
Open the window and air the room.
Then put these clothes in the wardrobe.
Then make the bed.
Dust the dressing table.
Then sweep the floor.
- must
must是一個情態助動詞,表示"必須"、"應當",與have to相似,表示不可逃避的義務。在說話人看來,沒有選擇餘地。但是,must帶有個人色彩,表示說話人的主觀意圖。表示個人感情時通常用must。You must…(你必須……)表示說話人說/認爲……是必要的。如:
You must sweep the floor.
你必須掃地。(我說這有必要)
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