just saw 和 have just seen的区别?

just saw 和 have just seen的区别? have just和just的区别 have just和just now的区别 have just seen 和have already seen有什么区别呢 have just seen 和have already seen有什么区别呢拜托各位了 3Q have already 和have just的区别?already 和 just 的区别? I ____the boy in the classroom just now.填see、saw、have seen、h just 和just now的区别 just now和just的区别 just和just now 的区别 just和just now的区别 I have never seen it和 I never saw it 的区别.