概述：句子是表达思想的基本单位。句子成分是指在句中起着不同语法作用的部分。英语的句子成分(sentence elements)主要有主语(S)、谓语(V)、宾语(O)、补语(C)、状语(A)、表语(P)、定语(Attr.)等。
[观察例句]
黑体部分在句中作什么成分？
1．The early bird catches the worm.宾语
2．They are Chinese travelling abroad.表语
3．In the morning we often hear the birds singing merrily.宾语补语
4．She bought her child a storybook.间接宾语；直接宾语
5．There is a picture on the wall.主语
6．The manager asked the college student to come in.谓语
7．Girls prefer to see women doctors.定语
8．Light travels most quickly.状语
