北京到白洋淀火车:1:-------have known each other since fiver years ago .

1:-------have known each other since fiver years ago . ——Have you known each other for long? ——Have you known each other for long? If I had known that,I could have helped you.had和known怎么都是过去式，have在这里是什么意思 I have known Mary for years and I am very familiar with her,but I have never she is known to have been wreaking on the problem for many years.（如何翻译） she should have known better than to ask jim for help. 不好意思再问下~I should have known all along 中的along是个什么用法~? be known as 是什么意思 A well-known phrase