动词不定式专项练习一、动词不定式作主语1. Its our duty _ the room every day.A. to clean B. cleaned C. clean D. cleans(甘肃省)2. Its hard for us _ English well.A. learn B. learns C. to learn D. learning(江西省)3 Its very nice _ you to get me two tickets _ the World Cup.A. for, of B. of, for C. to, for D. of, to(安徽省)Keys: 1. A 2. C 3. . B简析动词不定式作主语时,可以直接放在谓语动词前面的主语位置,也可以用先行词it作形式主语,而将真正的主语(不定式)置于后面。常见的句式有:(1)It is +形容词(of sb)to do sth.(2)It is +名词(for sb)to do sth