I have seen him before have后面应该用什么词 just already never ever 还是since

翻译：I have never seen him. Have you seen him yet?--Yes,I have seen him ____.just还是already? i was to have seen him last week ____he____(come)yesterday,I would have seen him. I have not seen him for the last two months. I have seen him somewhere.( 改为否定句) Never have I seen him before和Never before have I seen him 是一样的吗 I have seen him yesterday.如果不对这个意思该怎么表达?I have seen him this morning呢? I saw him this morning.与I have seen him this morning 怎么翻译,区别是? i never saw him和i have never seen him有什么区别? 含有一个分词短语I have never seen him before.So I did not recognize him. Have you seen him today? Yes, I saw him this morning.翻译一下,谢谢 have you seen Tony recentlyYes ,i 1(.have seen )him the other day on the street 2.saw ... I kept looking at the man,wondering ______________.A whether I have seen him before B where I had选哪个?理由是什么?选项:A whether I have seen him beforeB where I had seen him beforeC when I had seen him beforeD that I had seen him before i have seen it Oh,I have seen never have I seen him before.never before have I seen him .哪个对?why?那么请问，为什么用never before has china developed rapidly? i forget wheter i (have)seen him before.为什么不能用had?