英语句子分析Two men were standing at a bar.我分析是two man是主语,were是系,s

were standing 不是系表结构,是过去进行时态
你知道现在进行时态的构成吧!be + doing 正在做.be动词只是做组成现在进行时态的助词而已,没有意义.
Two men are standing at a bar.
这个句子是用的过去进行时态：was/were + doing 过去正在做.
be动词做系动词时,后面接名词,形容词等
She is a teacher.She is beautiful.
本句子还原到一般现在时态：
Two men stand at a bar.