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。
J．用于感叹句。
不定式可用于感叹句，含有惊异、不满、惋惜或赞美等感情色彩。
To think
that he should do this!想想，他竟然干出这等事！（表示惊讶）
Oh, God,
to see her dance !哦，天哪，看看她的舞蹈！（表示赞美）
To think
that all the money has been wasted.想想，所有的钱都被浪费掉了！（表示不满）
一、关于不定式符号的几个问题
A．不带to的不定式
1．在口语中，动词原形come和go后可接不带to的不定式。
Go tell
her.去告诉她吧。
Come
have a glass.来喝一杯。
2．在why引起的一些问句中，疑问词直接跟动词原形或not+动词原形。
Why make
so much noise 为什么发出这么大的噪音？
Why not
join us 为什么不加入我们？
3．在had
better, had best, would rather, would rather...than, would sooner, would
sooner...than, cannot but, cannot choose but, cannot help but等结构后直接跟动词原形或not
+动词原形。
You'd
better listen to your teacher's opinion.
你最好听一听老师的意见。
We had
best call for the doctor at once.我们最好马上就请医生来。
She
can't do anything but ask silly questions.她一直在问一些愚蠢的问题。
Rather
than ride on a crowded bus, he always prefers to ride a bicycle.他宁愿骑自行车，也不愿挤公共汽车。
He
cannot but move to another street, because his building has to be pulled down
soon.他不得不搬到另一条街上去，因为他住的大楼很快就要被推倒。
We
cannot help but admire his courage. 我们情不自禁地钦佩他的勇气。
4．如不定式前有行为动词do，那么在表语从句中的不定式和介词except或but之后的不定式可不带to。
The only
thing I could do was go home.我能做的唯一一件事就是回家。
They
could do nothing but wait for the doctor to come.他们只能等待医生的到来。
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