系动词不能单独作谓语,与后面的表语一起构成谓语,系动词后常接形容词/名词作表语,如 You look very happy. It sounds interesting. The food tastes delicious. He feels very tired. They are students.
首先这个问题你其实可以问老师，老师一定很乐意为你解答，而且讲得会很详细，也便于你理解和记忆，好过在网上乱查。回答你的问题，最简单的，be动词可以做系动词，比如，It is good.给你个句子It looks great!(它看起来真棒)中间那个look就算是系动词了，也就是说联系主语和表语的词，像feel,sound,seem等，可以接表语和表语从句，比如，It seems that you a...
