摘要：不定式或动名词用作主语.而分词不能担任句子中的主语. [考例]It's very nice pictures for me. [天津] A. of you to draw B. for you to draw C. for you drawing D. of you drawing [答案]:A.[解析]考查It's+形容词+of/for sb. +to do sth.句中it为形式主语.to do是真正的主语.当形容词是表示品质意思时.应该用of sb．.其他形容词用for sb．.故此题答案为A.

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