不定式短语作定语时什么时候用主动什么时候用被动形式? 1、不定式修饰的名词或代词和不定式逻辑上构成主谓关系时,不定式往往用主动式.eg: Have you got a key to unlock the door? 2、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,又和该句主语构成逻辑上的主谓关系时,不定式常用主动形式. eg: I have got a letter to write. He need a room to live in. 3、在there be 句型中,当说话人考虑的是必须有人去完成某件事时,不定式用主动形式;如果说话人强调的事情本身必须完成,则用被动形式。 eg: There is a lot of work to do。(Somebody has to do the work。)
There is a lot of work to be done. (The work has to be done.)