（一）主语+谓语+（宾语）+（状语）
Kitty can swim.Kitty会游泳。
The baby is crying.婴儿在哭。
My friend is playing games on the computer now.我朋友正在电脑上玩游戏。
（二）主语+系动词+表语
He is a student.他是名学生。
His mother likes singing.他妈妈喜欢唱歌。
（常用系动词：be，become，get，feel，look，smell，sound，etc.）