动词不定式1．feel, hear, listen to 等感观动词和 have, let , make等使役动词后的补足语，在主动语态中，不定式不带to；在被动语态中，则必须带to。如：I often hear him sing the song. / He is often heard to sing the song.2. 不定式短语位于介词but, except, besides后时，如果这些介词之前有行为动词do 的各种形式，那么，这些介词后的不定式不带to，否则要带to。如：She could do nothing but cry. / It has no choice but to lie down and sleep.3. 不定式修饰的名词或代词与不定式逻辑上构成主谓关系时，不定式往往用主动形式。如：Have you got a key to unlock the door (A key unlocks the door.)4. 不定式和它前面被修饰的名词或代词构成逻辑上的动宾关系，又和该句的主语构成逻辑上的主谓关系时，不定式常用主动形式。如：I have got a letter to write.( I write a letter.)5.如果不定式作表语形容词的状语，且和句中主语构成逻辑上的动宾关系时，不定式多用主动形式。如：The book is difficult to understand.( to understand the book)
直接引语是祈使句时间接引语为不定式，作ask , tell, beg, order, warn, advise等动词的宾语补足语（don't 变为not ）.The teacher said to the boy, 'Open the window.' →The teacher told the boy to open the window.His father said to him, “Don't leave the door open.” →His father told him not to leave the door open.[注意]（1） 有些表示建议、提议、劝告或要求的祈使句，可以用suggest ,insist等动词 加以转述。例如：He said, 'Let's go to the theatre.'→He suggested (our )going to the theatre.或He suggested that we(should) go to the theatre.(2) 'Would you mind opening the window' he asked.→He asked me to open the window.'Why don't you take a walk after supper' he asked .→he advised me to take a walk after supper.'Shall we listen to the music' he asked.→He suggested listening to the music.</p 产品：澳博培训供货总量：不限产品价格：议定包装规格：不限物流说明：货运及物流交货说明：按订单
