第一个不定式的特殊句型:too…to一般用来表示太…以至于…
He is too excited to speak.
他太激动了，说不出话来。
---- Can I help you ?
需要我帮忙吗?
---- Well, I'm afraid the box is too heavy for you to carry it, but thank you all the same.
不用了。这箱子太重，恐怕你搬不动。谢谢您。
如在too前有否定词，则整个句子用否定词表达肯定， too 后那个词表达一种委婉含义，意 为"不太"。
It's never too late to mend. (谚语)
改过不嫌晚。
It's never too late to improve your diet.
什么时候改善饮食都为时不晚。
《柯林斯高阶英汉双解学习词典》
Americans are never too keen to leave their beloved country
美国人从不急于离开他们热爱的国家。
It's never too late for you to give up smoking.
戒烟对你来说永远都为时不晚。
It's never too late to tell someone you love him. 如果你想告诉某人你爱她（他），此刻永远都不算太晚。
当too 前面有only, all, but时，意思是：非常… 等于very。
I know only too well that plans can easily go wrong
计划很容易出岔子，我太清楚这点了。
I was only too glad to help him if he asked.
如果他提出来，我乐得帮助他。
The Conservative Government was only too quick to hush him up.
保守党政府很快就堵住了他的嘴。
《柯林斯高阶英汉双解学习词典》
I'll be only too pleased to help them out with any queries.
我非常乐意为他们答疑解惑。
When the new baby comes along it is only too easy to shut out the others.
新生儿出世后，其他孩子极容易受到冷落。
I'm only too glad to offer you my services.
乐于为您效劳。
I'd be only too pleased to help, but I'm busy at the moment.
我非常乐意帮忙，但我现在太忙了。
I'm only too pleased to be able to help you. 我非常高兴能帮助你。
He was but too eager to get home. 他非常想回家。
It was all too easy to believe it.
这太容易令人相信了。
《柯林斯高阶英汉双解学习词典》
I'd left it all too late in the day to get anywhere with these strategies.
我按兵不动时间太长，致使这些策略都不管用了。
《柯林斯高阶英汉双解学习词典》
Teenagers occasionally find it all too much to cope with and lapse into bad behaviour.
青少年偶尔会因感到压力太大无所适从而做出不良行为。
It is all too easy to lose sight of what is happening on our own doorstep
我们很容易无视身边之事。
He was well-built, but too fleshy to be impressive.
他肌肉发达，但是太胖了，没给人留下好印象。
《柯林斯高阶英汉双解学习词典》
第二个不定式的特殊句型：so as to, “为了、以便”一般用来表示目的；它的否定式是so as not to do“以免、生怕、免得”。
如：
How can faculty improve their teaching so as to encourage creativity?
教师们如何才能改进教学以激发创造性呢？
It was virtually impossible to synchronise our lives so as to take holidays and weekendstogether
想让我们的生活步调保持一致好一起去度假和过周末几乎是不可能的事。
One should learn from past mistakes so as to avoid falling into the same old trap again.
要从过去的错误中吸取教训，以免重蹈覆辙。
Kemp knocked loudly so as to be heard above the high babble of voices
肯普大声敲着，好让人们在一片高声喧嚷中听到他的声音。
Write home as often as possible so as to relieve your mother from anxiety.
尽量多给家里写信，免得你母亲牵肠挂肚。
Let's turn in early, so as to get up early tomorrow to catch the train.
今儿早点睡，明儿好早起赶火车。
Perform meritorious service to atone for one's crimes so as to obtain clemency from the people.
立功赎罪，以求得人民的宽恕。
Tom kept quiet about the accident so as not to lose his job.
汤姆对事故保持沉默是为了不丢掉他的工作。
Go in quietly so as not to wake the baby.
轻点进去，别惊醒了婴儿。
He told a lie so as not to make his mother sad.
为了不让母亲伤心，他说了谎。
We ran all the way so as not to be late.
为了别迟到我们一路上跑来的。
He promised to be quick so as not to inconvenience them any further.
他许诺尽快完成，以免给他们带来更多不便。
Claire positioned herself so as not to obstruct David's line of sight.
克莱尔为了不挡住戴维的视线挪了一下位置。
We left in the daytime so as not to arouse suspicion.
我们在白天离开以避免引起怀疑。
I was beginning to feel alarm, but kept it to myself so as not to worry our two friends.
我开始有点慌了，但仍旧不动声色，免得我们的两个朋友担心
They dress in quiet colors so as not to call attention to themselves.
为了避免别人注目，他们穿得很朴素。
He disconnected the phone so as not to be disturbed.
他为了不受打扰，把电话线路关掉了。
再例如：so kind as to ---劳驾、务必
Would you be so kind as to tell me the time?
劳驾，现在几点了。
Would you please be so kind as to let us in?
请您高抬贵手，让我们进去吧！
Would you be so kind as to lift the box onto the shelf?
劳驾您把这个盒子抬到架子上好吗？
Would you please be so kind as to give him this letter when you see him?
您见到他时，费心把这封信交给他。
Please be so kind as to see to it that all the alterations are made at once!
请务必立即执行变更！
Please be so kind as to take good care of him.
请惠予照拂。
Please favour [ enlighten] me with your instructions.; Be so kind as to give me a reply, please.
请不吝赐教。
加载中,请稍侯......
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