Question

7．對(duì)我們來(lái)說(shuō)，每天在閱讀上花些時(shí)間是必要的．
It is necessary for us to spend some time reading every day．

Answer 1

分析 It is necessary for us  to spend some time   reading．

解答 答案：It is necessary for us  to spend some time   reading．表達(dá)的是客觀事實(shí)用一般現(xiàn)在時(shí)，表示對(duì)某人來(lái)說(shuō)做某事是怎樣的用it's+adj+for sb+to do sth，necessary必須的，花時(shí)間做某事spend+時(shí)間+doing sth，read閱讀，故答案是It is necessary for us  to spend some time   reading．

點(diǎn)評(píng) It's+adj．+for sb．+to do（ sth．） 與 It's+adj．+of sb．+to do（ sth．）
用of 的話，adj就用來(lái)形容sb的．即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..故可以換成 sb is adj to do 
比如：it‘s nice of you to help me．=you are nice to help me．
1 It's very kind of you to help me．你能幫我，真好．
2 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．
用for 是因?yàn)榍懊娴腶dj是來(lái)描述do后面的sth．即形容詞僅僅是描述事物，不是對(duì)不定式行為者的品格進(jìn)行評(píng)價(jià)，用for sb．，這類形容詞有difficult，easy，hard，important，dangerous，（im）possible等．如 
1 It's very dangerous for children to cross the busy street．
對(duì)孩子們來(lái)說(shuō)，穿過(guò)繁忙的街道很危險(xiǎn)．