形容词
通常形容人或事物的状态, 性质, 大小等, 通常用在名词前, be动词后
the beautiful girl.
The girl is beautiful.
The + 形容词 = 复数名词, 一类人或事物, 后面的动词使用复数
The old need more care than the young.
副词
可以修饰动词, 形容词, 其它副词以及其它结构
He runs fast.
She is very beautiful.
They work very hard.
副词的位置
放在助动词之后, 实义动词的前后都可以
He speaks very fast.
放在形容词之前, 其它副词的前后都可以
They have already left.
多个助动词, 放在第一个助动词之后
They have already been repaired.
常用的频度副词
always, usually, often, somtimes, never, 一般放在be动词后面, 实义动词前面; 助动词和实义动词之间
He always come early.
She often writes homework at 7:30.