此句型中的adj.主要描述某人的品德、特征。能用于该句型的形容词有： kind, nice, wise, silly, polite, impolite, friendly, foolish, clever等。
如： How silly it was of you to give up such a good chance！
It is friendly of the family to try to make me feel at home in their house.
4.It is ＋adj.（＋n.）＋doing sth.
此句型中的形容词和名词常见的有：no／little use, no／much good,useless等。如：
It’s no use crying over spilt milk.
5.It takes sb.＋一段时间＋to do sth. 表示“做某事花费某人多长时间”。如：
It took us half an hour to ride to the town by the sea.
6.It is ＋及物动词的过去分词＋that从句
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