3.宾补
want,tell,ask,allow,invite,encourage,teach,wish,order,get,expect--sb<not> to do
remind,warn,need cause,would,volunteer
He askd me not to copy others' homework.
let,have,make,see,watch,notice,hear,keep,feel--sb do sth
You make me cry,make me laugh.
4.表语
A good way to solve the problem is <font color="#c41230">to</font> communicate with others.
5.状语
You should do what you can（do）<font color="#c41230">to（目的状语）</font> protect the wild animals.
in order to do=so as to do
6.独立成分
to be honest,to tell you the truth,to begin with,to start with,to be frank
补充：It's+形+of sb to do=sb be 形 to do（形容词表示品格）
可为;kind,nice, good, clever,foolish,right,wrong,careful
It's kind of you...=you are kind...
7.不带to的不定式<font color="#c41230">（易混）</font>
had better do sth,why not do,would rather do than do,
prefer to do rather than do,could you please do sth?,
do nothing but do sth
1.主语
To talk to her is to talk to a wall.
To know everything is to know nothing.
变形式
It be 形容词 for sb to do sth.
It's one's duty/turn to do sth.
It take sb time to do sth.
2.宾语
love like,hate,dislike,start,begin,want,need,hope,wish,plan,decide,afford,happen
foget remember,refuse,try,fail,manage,pomise,cotinue,learn,pretend,offer--to do sth
He failed <font color="#c41230">to</font> keep his word.
He offered <font color="#c41230">to</font> help the disabled.
7.其他
<1>形式宾语find，make,think it 形 to do
I find it easy to get on well with him.=I find that it's easy to get on well with him.
<2>who,what,when,where,why,how--to do
I don't know how to solve the problem=I don't know how I can solve the problem
<3>be 形 to do sth--sorry,happy,glad,sad,will,excited,sure,afraid
He is not willing to get along with us.
Be sure to come here on time.
<font color="#c41230"><4>too...to--do </font> You are never too young to learn something,
<font color="#c41230">so...that+句子</font> I am too tired to stay up=I am so tired that I can't stay up.
<font color="#c41230">enough...to</font> The room is big enough to hold 70 people.
<font color="#c41230"><5>the first/second to do </font> He is always the first one to get to school.
