■第一個(gè)問題：　　

你提的第一個(gè)問題比較少見，個(gè)人認(rèn)為在 a little, a few 前要要不用so 而要用such。不過我在手頭的若干本英美詞典和語法書上沒有找到相關(guān)的例子。我在“英國國家語料庫”中分別輸入 such a little 和 such a few，結(jié)果如下：　　

◆關(guān)于 such a little 的用法只有25例，但大多數(shù)是 such a little后接可數(shù)名詞的用法（如such a little boy之類的），such a little后接不可數(shù)名詞的實(shí)例比較少，只有幾個(gè)例子，如：　　

His sister had lived in the big gloomy house for such a little time.　　

The city spread out below her looked so calm, almost as calm as she had felt such a little time before.　　

◆關(guān)于 such a few 的用法只有一例：　　

We worked together as a Club on this project, but one by one the members dropped by the wayside, until the good lady decided it wasn't worth wasting the petrol coming to collect such a few items.　　

■第二個(gè)問題：　　

在 so pretty a girl, such a pretty girl 這類表達(dá)中，如果名詞是復(fù)數(shù)或不可數(shù)，不能用 so，如不能說 so pretty girls，而說 such pretty girls。（這類搭配與是否是結(jié)果狀語無關(guān)）　　

■第三個(gè)問題：　　

應(yīng)該說 She is a so adorable and smart a girl that ...　　

這類表達(dá)與是否是結(jié)果狀語無關(guān)，即使不是結(jié)果狀語從句也是如此。如：　　

Everyone likes her, for she is a so adorable and smart a girl.　　

■The parents love their son to such an extent that they have tried to satisfy his every demand 的倒裝句可以是：To such an extent do the parents love their son that they have tried to satisfy every demand.　　

但個(gè)人認(rèn)為The boy is interested in such a lovely toy that his parents decide to buy it for him.不太好變?yōu)榈寡b句（講不出什么理由，好像主要是變?yōu)榈寡b句后意思上不太妥）。但下面這句可以變：　　

The boy is interested in such things that his parents feel worried about it. → In such things is the boy interested that his parents feel worried about it.　　

The boy spoke in such a strange voice that every one of us felt surprised. →In such a strange voice did the boy speak that every one of us felt surprised.　　

歡迎廣大用戶朋友給出更合適的理由。

■to 的前面可以用for sb這樣的邏輯主語，即可以說 so.... as for sb to, so as for sb to do. 但比較少見。如《詳解英文法》（日本宮川幸久著）就認(rèn)為：in order for sb to do sth 也是有可能的。但 so as for sb to do sth較少見。