第五篇   動  詞 (Verb)

第九章   助動詞   

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上述這些規定都是屬於強制性主詞不得不遵守因此當一般人轉述這些規定時應該用 have to 代替 must否定的 mustnt 是表示禁止。  如:

(1)  

You have to cross the railroad line by the footbridge.

(你必須由人行天橋穿越鐵道)

(2)

You mustnt walk across the railroad line.

(你不可以穿越鐵軌)

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若非說者自己發號施令而是轉述他人的命令,應該用 have to。  如:

(1)

You have to be ready before dawn. That is an order.

(你得在天亮前準備好這是命令)

(2)

I cant go to class because I have to pick up my father at the airport.

(我不能去上課因爲我必須到機場去載我爸爸)

pick up 作“搭載”講

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must帶有說話者濃厚的主見﹐或說話者認爲事關緊要;若只是敍述客觀的情況所必須並不帶有說話者的主見不用 must該用 have to  如:

(1)

He sees very badly; he has to wear glasses all the time.

(他視力很差他一直得戴著眼鏡)

(2)

You have to clean your own clothes when you are in the army.

(在部隊裡你得自己洗衣服)