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　　1. be worth doing 值得被……（主动形式表被动含义）

　　The book is well worth reading.

　　这本书很值得被读。

　　2. be busy doing 正忙着做……

　　I am busy preparing for the coming final exam.

　　我正忙着为即将到来的期末考试做准备。

　　3. too…to do... 太……而不能……

　　The boy is too young to go to school.

　　这个男孩太小了以至于不能去上学。

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

　　She worked so hard as to pass all her tests.

　　她学习如此努力以致于通过了所有考试。

　　5. It takes sb. some time to do sth. 做某事花费某人......时间

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

　　每天上学花费我15分钟的时间。