the lady who is standing behind the counter

the lady who is standing behind the counter The lady who is standing behind the counter. 为什么The lady who is standing behind the counter.不能改成The lady the lady who is standing behind the counter请问为什么用is不用was 1.which are on the counter 2.The lady who is standing behind [the lady who is standing behind the counter.]怎么理解这个句子? The lady who is standing behind the counter served me?请问这句是什 请教此句英语语法：the lady who is standing behind the counter. 连词成句1.counter,the,behind,lady,who,the,standing,is,me,served. 新概念1第121课,the lady who is standing behind the counter.这句话,为什 The lady who is standing behind the counter.请问英文高手这类句子中为什么要用 The lady who is standing behind the counter.先行词是哪个,引导词是哪个,定语