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. tooto 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如此以至于.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.
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