1. 功用：形容詞的功用是修飾名詞或當名詞的補語。
例：
1. It is an important book about American history. (修飾book)
2. Food is necessary for our life. (當主詞補語)
3. The story made me sad. (當受詞me的補語)
2. 位置：形容詞常見的位置如下：
(a)adj+ N：形容用來修飾名詞通常應擺在名詞之前。
例：1. Many students are interested in practical subjects such as international trade.
(b) S+ V+ adj或S+ V+ O+ adj：此種位置是屬於補語的位置，亦即形容詞用來當作主詞補語或受詞補語。 (請參考第一章第三節基本句型)
例：
1. He looks upset about the decision. (當主詞補語)
2. The oranges taste delicious. (當主詞補語)
3. Eating too much always makes me uncomfortable. (受詞補語)
4. We find it interesting to read novels. (受詞補語)
註：大部份的形容詞都可用於(a)或(b)的位置，但有一類以a為開頭的形容詞，如alike(像的)，alone(單獨的)，alive(活的)，afraid(害怕的)，awake(醒的)只能用於(2)的位置，當補語功用。
例：
1. The two brothers are very much alike.
2. He was alone in the house.
(c) 以~one, ~thing, ~body為結尾的名詞中，形容詞擺在這類名詞的後面。
例：
1. I am looking for something cheaper.
2. There is nothing interesting about the story.
(d) n+數目 the+序數+n
例：
1. Gate Five = the Fifth Gate
2. World War Two = the Second World War
(e) S+ be+ p.p.+ adj：此種結構表達主詞“被認為‥”，“被發現‥”，“被證明為‥”，故用adj當主詞補語。常用的動詞有consider, believe, think, find, prove。
例：
1. He was considered innocent.
2. He was found dead in the morning.
3. The merchandise is proven dangerous.
英文文法
