狀語從句 Adverbial Clause，從句用作狀語稱為狀語從句。根據用途，狀語從句可分為時間、地點、原因、條件、方式、讓步、結果、目的等狀語從句。
I.時間狀語從句
時間狀語從句表示時間，常用的關聯詞有when, until, as, after, before, once, since, as long as, whenever等等。
例: 1) When you cross a main road, you must be careful.
2) He went out to play football after he had finished his homework.
3) Wait until you are called.
4) I can't recognize you. You are so changed since last we met.
5) He didn't go to school until he was eleven.
You can use my house as long as you are careful.
He is so terrible once he is drunk.
I listen to the radio while I walk every evening.
II.地點狀語從句
地點狀語從句表示地點，常用的'關聯詞有where, wherever, anywhere等。
例如：1) Put it where you found it.
2)Sit down wherever you like.
3)Anywhere she goes, he goes too.
III. 原因狀語從句
原因狀語從句表示原因或理由，常用的關聯詞有because, as, since, in case等。
1)I eat ice-cream so much because I like sweet food.
2)As I didn't know the way, I asked a policeman.
3)Since you won't help me, I'
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