12.
necessary,do.It is necessary to do exercise..

分析 鍛煉是必要的.

解答 答案:It is necessary to do exercise.圖片上是一些人在做鍛煉,necessary是形容詞"必要的",故造句每天鍛煉是必要的.是在說(shuō)客觀事實(shí)用一般現(xiàn)在時(shí),用句型it's+adj+to do sth,it是形式主語(yǔ),動(dòng)詞不定式是真正主語(yǔ),do exercise做鍛煉.故答案是It is necessary to do exercise.

點(diǎn)評(píng) it's+adj.+for sb.to do sth.結(jié)構(gòu)是一個(gè)陳述句,表示說(shuō)話人對(duì)客觀事件的決斷,比較正式,希望大家學(xué)習(xí)時(shí)注意.  若形容詞是描述不定式行為者的性格、品質(zhì)的,如kind,good,nice,right,wrong,clever,careless,polite,foolish等,用of sb..   
 It's very kind of you to help me.你能幫我,真好.   
 It's clever of you to work out the maths problem.你真聰明,解出了這道數(shù)學(xué)題.

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