1. be worth doing 值得被……（主動形式表被動含義）

　　The book is well worth reading.

　　這本書很值得被讀。

　　2. be busy doing 正忙著做……

　　I am busy preparing for the coming final exam.

　　我正忙著為即將到來的期末考試做準備。

　　3. too…to do... 太……而不能……

　　The boy is too young to go to school.

　　這個男孩太小了以至于不能去上學。

　　4. so+adj./adv. as to do 如此……以致于......

　　She worked so hard as to pass all her tests.

　　她學習如此努力以致于通過了所有考試。

　　5. It takes sb. some time to do sth. 做某事花費某人......時間

　　It takes me 15 minutes to go to school every day.

　　每天上學花費我15分鐘的時間。

　　6. sb.spends some time（in）doing sth. 某人花……時間做某事

　　I spend 20 minutes in doing my homework every day.

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