②The reading room of our school library can hold 800people.
③All moving bodies have energy.
①②句动名词作定语说明一种性能，即：用来……的；第③句为现在分词作定语，单个分词作定语常置于 被修饰词之前，与被修饰词之间，可构成逻辑上的主谓关系，分词短语作定语常置于被修饰词之后。如：The man standing at the school gate is Professor Hua.
五、不定式作补足语
⒈作宾语补足语
一些及物动词除要求按宾语外，有时还需要有宾语补足语，说明宾语的行为、状态、特征，这时意思才相 对完整。
(1)常要求不定式作宾补的动词有：allow,ask,advise,beg,cause,drive（强迫），encourage,expect,fo rbid,force,get,would like(love,hate),order,permit,persuade,teach,tell,want,warn,wish等。如：
①Would you like me to give your regards to Mary?
②I want you to understand the whole passage clearly.
(2)部分动词后常接to be＋形容词、名词短语等形式，有时to be可省略，如：believe,consider,discov er,find(=consider),feel(=think),imagine,judge,know,prove,think,suppose,see(=understand),understa nd等。
①We all believe John(to be)honest.
②I consider him(to be)one of the best biology teachers of No. 1 Middle School.
但当不定式是完成式时，to不能省略，如：We consider him tohave been foolish.
(3)感觉动词和使役动词后用作宾补的不定式须省略to。
①I didn`t hear anyone say anything about it.
②They make the students do too much homework every day.
这种句式在变为被动语态时，to不能省略，如第②句：Thestudents are made to do too much homework
every day.
(4)help,know后面的"to"可有可无。如：
Would you please help me(to) fill in the taxform?
I`ve never known her(to)be late before.但：He was known to have been to France before.
(5)部分短语动词后，常接不定式作宾补，如：
You may depend on them to be there early.
The Party calls on us to increase production and practise economy.
常这样用的短语动词有：ask for,care for,call on,count on,depend on,wait for,long for（渴望）， prepare for,wish for等。
⒉作主语补足语
不定式作主语补足语，和主语构成一种逻辑上的主谓关系。如：