关于英语语法Have we met before?翻译成“我们见过吗?”,这是什么语法,如果变成陈述句的话就应该是We have met before.为什么用完成时啊?

关于英语语法Have we met before?翻译成“我们见过吗?”,这是什么语法,如果变成陈述句的话就应该是We have met before.为什么用完成时啊? I ___(go) with you if I have time tomorrow.We ___(be) good friends since we met at school. We have met only once.So I am unfamiliar with him.为什么用with,不是be unfamiliar to sb吗 We have been good friends since we met at school. 一道英语语法试题we have received your estimate for the alterations you propose,but have decided that_____would be too high.A.it B.they C.we D.you we have met our headmaster in several occasions 该错 We have never met each other.改为疑问句和陈述句 I think we have a met （s ） before. we I know somewhere have before met you怎么连 I think we have met some where and We____(be) good friends since we met at school. We may ____each other somewhere before.A meet B.met C.have met i dont think we have met before 中为什么不用had met 英语翻译we have met in somewhere.have we met in somewhere?这两个句子对吗?用had we met 有什么区别.have we ever met 还有没有别的句子也能表达这个意思? Dear Friend,I know that this mail will come to you as a surprise since we have not known or met be if i will forget you,so must be we have never met.谁帮我翻译下,大概意思我知道,就是总觉得读不通. We were both__when we met again because we have not seen each for a long time we met each other not long ago.同义句：we have _each other ________.