E．It
is +形容词+ forof sb + to do结构
在“It is +形容词+
of sb +不定式”结构中，形容词往往表示人物的性格和特征，如kind,
silly, good, unwise, clever, wrong, right, foolish, stupid, careless, rude,
impolite, bold, thoughtful, honest, bad, sensible, naughty等。在“It is +形容词+for
sb +不定式”结构中，形容词通常表示事物的性质，如important,
possible, impossible, necessary, difficult, hard, reasonable等。
It's
kind of you to think so much of us. 难为你这么为我们着想。(=
You are kind to think so much of us.)
How
careless it is of him to break such a valuable vase!他真不小心，把如此贵重的花瓶打破了。
It is
easy for me to see through his trick.我很容易看穿他的鬼把戏。(=For
me to see through his trick is easy.)
It is
hard for him to get rid of his bad habits.他很难改掉自己的坏习惯。
比较：
It is
good lf you to help me with my English. 你真好，帮助我学英语。（强调you的特征＝You
are good to help me.）
It is
good for you to give up smoking. 戒烟对你有好处。（强调的是give
up smoking这一行为＝Fof you to give up smoking
is good.）
F．分裂不定式
动词不定式to
do通常是不拆开的，但偶尔也可在不定式符号to和动词原形之间插入一个副词，构成分裂不定式。
He was
too ill to completely carry out that program.他病得太重，不能完成那个项目。
He has
made up his mind to once more try this method.
他已经下定决心再试试这个方法。
G．用作独立成分的不定式
有一些不定式短语可以作状语修饰整个句子，也可被称为插入语。
To be
honest, we are not sure to find the girl in the forest.说老实话，我们不能确保在森林里能找到那个女孩。
To be
frank, I don't agree with what you said.
坦率地说，我不同意你说的话。
必背：用作独立成分的不定式
to tell
you the truth说老实话
to be
frank 坦率地说
to begin
with首先
to be
brief简言之
to make
a long story short长话短说
to be
exact精确地说
to say
nothing of姑且不说
to
conclude总而言之
to be
sure诚然，固然
to do
him justice说句对他公道的话
so to
speak可以这么说
H．用主动式表示被动含义的不定式
动词不定式在句中究竟用主动还是被动，有时比较复杂，主要有下面几种情况：
1．不定式做后置定语，和被修饰的名词或代词构成逻辑上的动宾关系，但又和该句主语构成逻辑上的主谓关系时。
Do you have
anything to say on this question针对这个问题你有什么要说的吗？
He is a
pleasant person to work with.他是一个与其合作起来令人感到愉快的人。
2．不定式作形容词的宾语，和句子主语构成逻辑上的动宾关系时。
The book
is difficult to understand.这本书很难理解。
The
chair is comfortable to sit on.这把椅子坐起来很舒服。
3．There
be结构中，当说话人考虑必须有人去完成某件事时。
There is
nothing to worry about.没什么可担心的。
There is
nothing to fear.没有什么可害怕的。
比较：
There is
a lot of work to do.有许多事情要做。（表示某人必须做这工作）
There is
a lot of work to be done.有许多事情要做。（强调有许多事情必须做）
She has
two letters to type.她有两封信要打。（自己打）
She has
two letters to be typed.她有两封信要打。（别人打）
I．表示虚拟语气的不定式完成式。
I hoped
to have met him at the railway station, but he didn't turn up.我本希望在火车站接到他，但他未露面。
We would
love to have gone to the match, but the tickets were all sold out.我们原想去看这场比赛的，但票已售完了。
The
plane was to have taken off at 9, but something went wrong.飞机原计划九点起飞，但出现了一些故障。
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