非谓语动词作定语的用法是什么？
非谓语动词主要包括不定式、动名词和现在分词。
不定式做后置定语，表示将要做（还没有做）。现在分词做定语时,位置不定，如果是一个现在分词，前置，如果是短语后置，表主动。过去分词作定语和现在分词相同，如果是一个过去分词，前哗伐糕和蕹古革汰宫咯置，如果是短语后置，表被动。
式与其所修饰的名词可能是主谓关系。例句：
He was the last one to leave school yesterday．昨天他是最后一个离开教室的。
不定式与其所修饰的名词可能是动宾关系 例句：
Get him something to eat．给他拿点儿东西吃。
She has a lot of work to do in the morning．早上他有很多工作要做。
不及物动词构成的不定式做定语，要加上适当的介词和被修饰的名词形成逻辑上的动宾关系，这里的介词不能省去。
例句：
I need a pen to write with．我需要一支笔写字。
There is nothing to worry about．没有什么值得发愁的。
2.分词作定语时有下面几个特点：
（1）现在分词表示主动意义，过去分词一般表示被动含意。
（2）现在分词表示正在进行，过去分词表示状态或做完(完成)的事。
例句：
He rushed into the burning house．他冲进了正在燃烧着的房子。
The child standing over there is my brother．站在那儿的男孩子是我弟弟。
3.不定式和分词作定语时的时间关系
一般来说，不定式所表示的动作发生在谓语动词所表示的动作之后；现在分词所表示的动作与谓语动词所表示的动作同时发生；过去分词表示的动作发生在谓语动词所表示的动作之前。
例句：
Do you want to see the doctor to be sent for from Beijing?
你要见那位将从北京请来的医生吗？
Do you want to see the doctor working on the case report in the office?
你要见那位正在办公室里写病历的医生吗？
不定式to do在句中作定语置于被修饰名词后，常同该名词构成动宾关系，要是不定式是不及物动词，其后应加上必要的介词。例： I have something to say. (to say something )
有些名词常接不定式作定语，如：chance ,time ,reason ,way ,effort ,right (权利), movement等，例： You haven’t any reason to leave me. You have no right to do such a thing.
The first ,the last ,the second ,the best 等常与不定式连用作定语。例： He is always the first to come. She would be the last to agree to our plan.
当to go ,to spare 作“剩下”讲时可作定语。例： He had five minutes to go before time was up. They had only 100 dollars to spare.
不定式用在某些句子中作定语相当于一个定语从句，表示动作即将发生。例： There are many difficulties to overcome. = There are many difficulties that will have to be overcome.
现在分词与过去分词作定语
现在分词和过去分词在句中都可以作定语，但在语态和时间概念上有区别，在语态上，现在分词表主动，过去分词表被动，在时间上，现在分词表示动作正在进行，而过去分词则表示动作完成。例：
boiling water (主动、进行) boiled water (被动、完成)
有时过去分词则表示被动，不表示完成的动作，有时则表示动作的完成，不表示被动的动作。例： the fallen leaves (动作已完成) developed countries (动作已完成) an interested party (被动)
单个分词作定语置于被修饰词前。例： China is a developing country.
He lit a fire and from it took a burning stick. America is a developed country.
有些单个分词（尤其是现在分词）作定语时也可以置于被修饰词之后，特别如一些不定代词 anything ,something ,everything ,nothing 等则应后置。例： the experience gained (获得的经验) for the time being (暂时) for years running ( 一连数年)
分词短语置于被修饰词之后
The pen lying on the table belongs to you. The boy making faces is my son.
I like songs performed by Mao Aming.
其实作定语的分词短语可以扩展为定语从句。如上述三句可改为： The pen which is lying on the table belongs to you. The boy who is making faces is my son.
I like songs which was performed by Mao Aming.
现在分词作后置定语表示一个（现在或将来）正在进行的动作，或者表示某经常性动作或状态。例：
Can you see the star moving in the sky? There is a piano standing in the corner.
如果分词所表示的动作在时间上同谓语动词所表示的动作不一致，不能使用现在分词，而应使用定语从句。例： I want to know the man breaking the window. (X) Break 的动作是先发生，上例不能用现在分词，应改为定语从句。如：„.who broke the window. Do you know anyone having lost money. (X) Do you know anyone who lost money. (V)
因此我们就知道在那种情况下定语从句可以用现在分词代替，即：定语从句动词所表示的时间同主句谓语动词的时间一致时。例： Did you see the man (who was) talking to the headmaster?
过去分词在时间上，表示的动作发生在谓语动词之间，表示与句中谓语动词相应的经常性动作；或表示一个正在进行的动作，用being +过去分词结构。例： Is this the book written ( which was written) by Henry James?
He was then a teacher respected ( who was respected ) by all his students. The matter being discussed ( which is being discussed ) is of great importance. He was invited to a meeting to be held ( which was to be held ) the next day.
动名词作定语
动名词单个词作定语时也置于被修饰词前，表示被修饰词的用途、类属等。例 ； a writing table = a table for writing (动名词)
a sleeping child = a child who is sleeping （现在分词） a swimming pool = a pool for swimming （动名词） a waiting room = a room for waiting （动名词） drinking water = water for drinking （动名词） No one is allowed to speak aloud in the reading room. （动名词） That is a shop dealing in walking stick. （动名词） The sleeping child was in a sound sleep. （现在分词） All bedrooms in this hotel have hot cold running water. (现在分词)
从上述看，单个动名词和现在分词都可以作前置定语，但现在分词和被修饰的名词在逻辑上有主谓关系，表示被修饰名词自身发生的动作或行为，而动名词和被修饰的名词不表示这种关系，只表示与被修饰名词的用途、类属等。 动名词作介词宾语构成的介词短语可定语。例： He is in the habit of rising early. ( of rising 修饰名词habit )
She has a good idea of playing snowball. ( of playing 修饰名词idea )
有些名词有时也可接不定式和其接“介词＋动名词”在意义上没有区别。例： That is the way of setting the problem. That is the way to settle the problem. 这类名词常用的有： time for doing sth. Reason of doing sth. Time to do sth. Opportunity of doing sth. Choice to do sth. Opportunity to do sth.
