1.现在分词作定语表主动,表进行.单个分词作定主常放在名词前,分词短语作定语放在名词后.例:a crying boy,a boy crying loudly,a running horse,a horse running fast
2.不定式作定语常放在名词后,表未发生.例：I have much homework to do.There are so many tools to choose from.我多是指后置定语，有合区别1.介词短语,定语从句,现在分词短语,过去分词短语,动词不定式,极个别副词都可作后置定语.例:a book on the desk, a woman who is working , a dog barking constantly, a dog tied to a tree, a chair to sit on, the weather today.后置定语译为汉语时多放在被修饰的名词之前。2。现分做定语表主动进行，过分做定语表被动完成，动词不定式做定语表还未发生。