参考答案： 不一定.一般情况下,be 动词后接形容词、名词、介词短语、名词性从句时,这些都是表语.例如： He is tall. He is a student. He is in Class Two. The question is when he can arrive at the hotel. 但是,be 动词还可构成各种时态,此时,be 只是一个助动词了,后面的部分不是表语.例如： He is studying English. He was struck in the leg by a bullet.
