such as 加名词，加动词时动词用动名词doing 中文意思是“如/像……”。
后也用and so on等等。例如昨天去书店我买了很多学习用品，如钢笔，笔记本，参考书等等。I bought many school things in the book store,such as a pen ,notebooks,reference books and so on.我们学校课外活动非常丰富，例如打篮球，踢足球，下象棋等等。There are many kinds of after-class activities in our school,such as playing basketball,playing football,playing chess and so on.
