Example:

• green grass (the adjective "green" describes the noun "grass")

有三种被称为原级，比较级和最高级形式的形容词，如 green, greener, greenest。

形容词可以分为七类：名词作为形容词，形容词修饰一个对象，数字作为形容词，代词和冠词作为形容词，多个形容词，复合形容词，形容词用作名词。

名词作为形容词

名词可用于限定（或描述）另一个名词，如goose，在这种情况下，没有比较或最高级的形式，如 "gooser" or "goosest."

有些名词可以通过添加诸如 -ish, -like, -ly, -y, -en, -al, -ar, -ory 的结尾而形成形容词.

Examples:

• He spoke in a childish manner.
• My, what a womanly figure you have.
• His teeth were yellowish in color.
• He was sitting at a wooden desk.
• He works at the main office.
• What a spectacular show!
• Our program is going through a transitory period.

通常情况下，结尾-en和-al将被删除，名词形式将单独使用，如 oak table, wool shirt, and coast line.

修饰对象的形容词

形容词如 "like" and "worth" 可用于修饰对象。

Examples:

• Stale bread tastes like Styrofoam.
• Your textbook is worth one dollar.

有时候介词就像 "of" and "with" 用来形成形容词。

Examples:

• She is fearful of dogs.
• Sometimes parents can be impatient with you.

数字作为形容词

Any words related to number are considered adjectives, including "two," "twenty," "few," "many," "dozen," "third," and so on.

代词和冠词作为形容词

代词如 "this," "that," and "those" 用于修饰名词的人称为示范性形容词。

物主代词如 "my," "your," and "his" 用来修饰名词的人称之为物主形容词。

Articles such as "a," "an," and "the" are also adjectives.

多个形容词

当使用多个形容词来修饰名词时，形容词可以用连词或逗号分隔。

Examples:

• Your teeth are strong and beautiful.
• You have strong, beautiful teeth.

复合形容词

名词和形容词可以组合起来修改另一个名词，在这种情况下，单词可以连字符号 -（尽管连字符通常是个人偏好的问题）。

Examples:

• He is a warm-hearted fellow.
• I can be empty-headed sometimes.

动词的过去分词也可以用作形容词，例如 "native born," "foreign made," "soft spoken," "warmly dressed," "well behaved," 等等.

Adjectives used as nouns

通过简单地使用形容词作为主语并省略其修饰的名词，可以使用形容词作为名词。 通常，用作名词的形容词是指由一群人（the wise）共享的特定品质（the pleasant）或特定的人类特征。

Example:

• We moderns are to the ancients what the poor are to the rich.

childish [´tʃaildiʃ]   a.孩子的；幼稚的   (初中英语单词)

wooden [´wudn]   a.木制的；呆板的   (初中英语单词)

program [´prəugræm]   n.说明v.为…安排节目   (初中英语单词)

fearful [´fiəfəl]   a.可怕的；担心的   (初中英语单词)

impatient [im´peiʃənt]   a.不耐烦的，急躁的   (高中英语单词)

related [ri´leitid]   a.叙述的；有联系的   (高中英语单词)

adjective [´ædʒiktiv]   n.形容词   (英语四级单词)

spectacular [spek´tækjulə]   a.壮观的；惊人的   (英语四级单词)