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t 作形式主語時(shí)常用兩種句式結(jié)構(gòu) : 句 型 用 法 It is + ad j . + for sb. + to do s th. 形容詞描述事物的特征、性質(zhì) , 如 : eas y , dif ficult , intere sting, f unny , danger o us, i m port ant , im possi ble , useful 等 It is + ad j . + of sb. + to do s th. 形容詞描述行為者的性格、品質(zhì) , 如 : kind, friendl y , nice, ri ght, cl ev er , polite, ca re le s s, cut e 等 ? ? 活學(xué)巧練 ? 9. It39。s so brave ______ the soldier to save the boy39。s life. ? A. to B. of C. for D. with ? 10. ______ is really hard ______ them to climb such a high mountain. ? A. This。 to B. It。 to C. This。 for D. It。 for ? 11. It39。s important ______ students ______ to their teachers carefully in class. ? A. for。 listening B. for。 to listen C. of。 to listen D. of。 listening ? 12. It39。s very important ________ healthily.(eat) ? 13. It39。s difficult for you ________ with the problem.(deal) B D B to eat to deal 考點(diǎn) 4 ...but