20．你真有禮貌，把座位主動提供給老人．
It's so politeof you to offer your seat to the old．

分析 of you to offer．

解答 答案：of you to offer．結(jié)合句意表示某人做某事真是怎樣，結(jié)合It's so polite聯(lián)想到用it作為形式主語，動詞不定式做真正主語，構成句型it's+adj+for sb to do sth某人做某事真是怎樣，故of you，提供某物給某人offer sth to sb（主動提供），故答案是of you to offer．

點評 句型"It is+adj．+（for sb）to do sth．"和"It is+adj．+（of sb）to do sth．"兩個句型中，for sb和of sb怎么區(qū)別，在使用時要注意adj是說明sb的品質(zhì)特點的還是說明to do sth的就可以了．說明sb的品質(zhì)特點用of sb；說明to do sth用for sb．簡單一句話說就是：說人的用of sb．說事的用for sb．

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