高三英语语法总复习训练材料动词不定式高三英语备课组 郭中伦一、不定式结构作主语To see one time is better than to hear a hundred times.To persevere means victory!注①:在很多情况下,特别是在口语中,常采用先行it代替主语,而把不定式后置:It’s a great pleasure to be here.It is not an easy thing to master a language.注②:这种后置不定式的结构也适用于某些谓语动词不是系动词的句子,如:It took us five h