Unit6Grammar.docx
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1、Unit 6 Grammar1 It is + adj. + to do sth. It 是形式主语,真正的主语是动词不定式短语to do sth。也可将动词不定式to do sth放在句首。It is necessary to train for the coming exam.To train for the coming exam is necessary.2 It is + adj. + for + to do sth.表语形容词adj.说明不定式的特征而不是表示人的品质或特征。常用于这种结构的形容词有:easy, difficult, important, hard, necessa
2、ry, possible, interesting等。It is difficult for us to finish the work today. (difficult说明to finish the work的特征)3 It is + adj. + of + to do sth.表语形容词adj.说明人sb.的特征。常用于这种结构的形容词有:kind, polite, clever, foolish, good, nice, generous, careful等It is generous of him to share his computer with you. (generous表示
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