4、Lo?Theyhavedifficultywalkingormoving.Wouldyouliketotakepartinthecompetition?语法：动词不定式 ：to + 动词原形 动词不定式的基本形式是"to + 动词原形"。动词不定式（或不定式短语）没有人称和数的变化，在句子中不能作谓语。动词不定式仍可保留动词的特点，即可以有自己的宾语和状语。动词不定式同它的宾语或状语构成不定式短语。如：to read the newspaper, to speak at the meeting 等 动词不定式具有名词、形容词和
5、副词的特征，因此在句子中可以作主语、表语、宾语、宾语补足语、定语和状语： 例句: 作主语: To learn a foreign language is not easy.作表语：Myworkistocleantheroomeveryday.作宾语: She wanted to borrowed my radio. They began to read and write. 作状语: She went to see her grandma last Sunday. He came to give us a talk ye
6、sterday. 作宾语补足语: Lucy asked him to turn off the radio. She asked me to speak more loudly Jim told Ling Feng to go home at once . The father made his son study hard. 作定语: Have you got anything to say? I had something to eat this morning . 注：作主语用的动词不定式常常为it替代，动词不定式（或短语）放在
7、后面。例如： It is not easy to learn a foreign language. It took us three days to do the work. 动词不定式的否定形式由"not+动词不定式"构成. 如: Tell him not to be late. The policeman told the boys not to play in the street.不定式省去to的情况: 在感官动词see，watch，look at，hear， listen to，feel和使役动词m
8、ake，have，let等所接的宾语中（不定式做宾语补足语），不定式应省去to。但是在被动语态中不能省。如： Let me listen to you sing the song. He watched his
