副词修饰动词,形容词或其他副词等,表示动作,状态的特征或某种性质的程度.
He shook his head sadly.(sadly是 副词)
she suddenly stopped.(suddenly是副词)
动词表示动作或状态,在句子中主要作谓语.
She works hard for a better result.(works是动词)
Mother will return home at 6p.m.(return是动词)
形容词表示人或事物的性质和特征,用来修饰名词或代词.
The milk tastes sweet.(sweet是形容词)
this made him quite happy.(happy是形容词)
代词用来替代名词、数词等
You can't smoke in a cinema.(You是代词)
He sand I saw each other at the same time.(He是代词)
We are friends.(We是代词)
介词用於名词或起名词作用的词(或词组,从句)之前,说明句子中词与词之间的关系.例如product(产品)和labour(劳动)本是两个互不相干的名词,但如果说product of labour(劳动的产物),介词of就使两个词联系了起来,并且说明了两者的关系.
名词表示人、事物或抽象概念
如:Tom is an actor.(actor是名词)
I saw Tom.(Tom是名词)
Tom's books.(books是名词)