关于句尾for doing, 和 to do. 拍吧拍吧，我就这样理解的。

Apolloemma

to do 在句尾，可以表示整句的状语，也可以表示为前面的前行名词的修饰语。

I.to do 表示状语：

1. to do 在句尾的时候，大多数是做主语和动词的目的状语的。

1）The contractors demolished the building to keep it from falling down accidentally. (to keep it ..是前句the contractors demolished the building的目的状语。)
2）Investors sold the stock rapidly to cause panic. (to cause panic 是前句investors sold the stock rapidly的目的状语。)
3）New genetic evidence provides compelling supports to classify A and B as seperate species. (to classify....是前句New genetic evidence provides compelling supports是目的状语。)

2. to do 在做状语是，表示的是人的意愿，需要主语是人而不能是物。 所以，
The contractors 是人， 可以有意愿，可以用to do表示目的。
Investors 是人，可以有意愿，可以用to do 表示目的。
New genetic evidence 不是人，不可以用to do 不是目的。所以第四句错误，可以改为。
New genetic evidence provides compelling supports for classifying A and B as seperate species.

II to do做定语：

也可以做定语，一般是出现的主语，和宾语的位置。表示的意思是，某个不知名的人通过先行词，以先行词为媒介，或手段，来达到某种目的。
Often, when you modify a noun with an infinitive, that noun is not the implied subject of the infinitive.
有些时候，先行名词和修饰它的不定式，一可以构成主谓关系。
但是，在句尾的时候，我就很容易将定语理解成目的状语。
1）A technique to alleviate pain is growing popular.
    This sentence means that you(or someone else) can alleviate pain by means of this technique. In other words, technique is not meant to be the subject of the action alleviate.
2）A plan to conquer the world is in his files.
     The author probably intends to say that the plan is a mean by which someone can conquer or will conquer the world. It is unlikely that the plan itself is actualy conquering the world or will conquer the world.
3）Austrilian embryologists have found that evidence to suggest that ..
    to suggest 是evidenc 的定语，说的是某人想通过evidence 想要suggest that..... 。而evidence suggesting that， 则是evidence itself 要suggest 一些东西。

此外，关于for，除了for doing 表示目的外，还可以自己作为subordnator 自己引导一个独立句子，做原因状语。

Apolloemma

Combining enormous physical strength with higher intelligence, the Neanderthals appear as equipped for facing any obstacle the environment could out in their path, but their relatively sudden disappearance during the Paleolithic era indicates that an inability to adapt to some environmental change led to their extinction.

(A) appear as equipped for facing any obstacle the environment could put in their path,
(B) appear to have been equipped to face any obstacle the environment could put in their path,
(C) appear as equipped to face any obstacle the environment could put in their paths,
(D) appeared as equipped to face any obstacle the environment could put in their paths,
(E) appeared to have been equipped for facing any obstacle the environment could put in their path,

BE 也出现了for doing ，和 to do 的区别的问题。 我想还是用to do 表示目的状语，表示主动形式下的，主语做某事的目的。

这个题尤其要有下面这句话做对比：
New genetic evidence 不是人，不可以用to do 不是目的。所以第四句错误，可以改为。
New genetic evidence provides compelling supports for classifying A and B as seperate species.

the Neanderthals appear to have been equipped to face any obstacle
the Neanderthals appeared to have been equipped for facing any obstacle
人有才能有目的，才能用to do 做自己的目的状语。

我就是不喜欢这个地方说成Idiom.

bejamin1111

学习了！顶！！！！！！！！！

Apolloemma

其实我今天就看这些句子有些不对劲了。 这几个to do 都是做定语吧。因为前面的动词， find, provide 不是实意动词，而是系动词。 后面跟一个直接宾语就行了吧。

左右疑惑不定ing. .......

atto

樓主的第三個例子，也就是OG 13-128題，其實是有問題的，不知道該不該單獨開個帖子來討論，既然你提到了，就先在這裡說一下吧。
1. 首先樓主的說法，to suggest做目的狀語，是站不住腳的，因為從語義上來說你可以find evidence to prove但絕對不能find evidence to suggest；
2. suggest及其後的從句是修飾evidence的，這一點毫無疑問，但很遺憾曼哈頓語法Idiom一章沒有單獨提到evidence的用法，但根據《麥克米倫高階英漢雙解詞典》，evidence後面可以跟of/for/in support of/in favor of以及that從句，但是沒有跟to do的；
3. Evidence suggests that是一個很常見的句式，主語+謂語+賓語從句，但在這裡evidence本身就是賓語，所以evidence suggesting that是一個很合理的結構，也很常見。OG的解釋是“A clear way of making this connection is to turn the verb suggests into a participle modifying evidence”，它自己都說是要把suggest變成分詞（participle），也就是suggesting或者suggested，又因為邏輯上來說Evidence suggests是主動含義，所以只能是現在分詞suggesting。這個解釋毫無疑問是對的，但解釋完了之後它自己卻有給了個E答案，自相矛盾。

Apolloemma

atto 发表于 2013-6-22 10:44
樓主的第三個例子，也就是OG 13-128題，其實是有問題的，不知道該不該單獨開個帖子來討論，既然你提到了， ...

嗯，是定语