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關閉窗口 ▲關于不定式表將來的深層分析：
該問題一般語法書都有論述，但大多不夠詳細。下面詳細解說：
在不同的語境中，“be+動詞不定式”結構可以表示多種不同的語義。
一、表示“計劃”或“安排”。
This line is to be opened to traffic next week. 該線路將在下周通車。
They are to meet at the gate of the school. 他們將在學校門口見面。
二、表示“命令”。一般譯為“必須”或“不準”。
No one is to leave the room without permission.
This naughty boy is to stay here until class is over.
三、表示“可能性”。
Are you to pay the debt for your wife?
The lovely puppy is nowhere to be found.
四、表示“意圖”或“打算”。一般譯為“想要”。
If you are to be there on time, you had better hurry.
If all of us are to remain friendly, we must be sincere with one another.
五、表示“應該”。
You have done so well. You are to be rewarded.
Such nasty questions are to be avoided.
六、表示“不可避免”或“注定發生”，意為“必定”。例如：
Your plan is to be a failure.
The murderer was sentenced to life imprisonment and was never to see his family again.
She did not think too much of her unkind acts. However, they were to be harmful to herself, too.
Tom wasn't worried about his head injury, but it was to be troublesome for him later.
七、表示“期待”。
The actual use of the newly invented equipment is still to be determined.
Henry's appointment with the firm is yet to be confirmed.
八、表示與將來不符或相反的“假設”。
If it were to rain tomorrow, we would not go outing.
Even if you were to take a taxi now, you would not be able to arrive at your destination on time.
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