正交函数集 证明:五、It is time for sth.和It is time (for sb.)to do sth.

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It is time for sth.和It is time (for sb.)to do sth.    It is time for sth. 是该干某事的时候了。for是介词,其后接名词。如:    1. It is time for class. 到上课的时候了。   2. It is time for lunch. 到吃午饭的时候了。   
   It is time(for sb. )to do sth. 是该(某人)干某事的时候了。to是不定式符号,后接动词原形。如:     1. It is time to go to bed. 是该睡觉的时候了。    2. It is time for her to answer the question. 是该她回答问题的时候了。