as在開(kāi)頭引導(dǎo)什么從句

　　As還可引導(dǎo)時(shí)間狀語(yǔ)從句,“當(dāng),隨著”：

　　例如：As the weather is colder and colder,the leaves of the tree is less and less.

　　As還可引導(dǎo)方式狀語(yǔ)從句,“按照”：

　　例如：You must do the work as I have told you.

　　As還可引導(dǎo)讓步狀語(yǔ)從句.“盡管”。但是注意,as引導(dǎo)方式狀語(yǔ)從句時(shí)從句必須倒裝。而且這種倒裝和一般的倒裝不一樣。as從句的倒裝一般是把從句的表語(yǔ)或作狀語(yǔ)的副詞提到as之前,（如果表語(yǔ)是一個(gè)帶有不定冠詞a或an的單數(shù)名詞,倒裝后a或an必須省略)。

　　例如：Though he is a little boy,he knows a lot.如果變成由AS引導(dǎo),就必須變成：

　　Little boy as he is,he knows a lot.

　　Though he works hard,he never succeed.

　　可變?yōu)?Hard as he works,he never succeed.