Have you seen my dictionary Yes.l put it in your desk just now
问题描述：
Have you seen my dictionary Yes.l put it in your desk just now
为什么用have.seen而不用Did.see
我觉得看没看到对现在没什么影响啊
答
提问者的本意是问你是否知道我的词典在哪里?侧重点是你是否知道我的词典在哪里(现在的状态),而不是你有没有见过我的词典(过去的动作).试比较：
Have you seen my dictionary?Yes,I put it in your desk just now./ No,I don't know where it is.
When did you see it?Yesterday.
使用过去时和完成时,其侧重点有明显区别,可根据提问者的本意及回答进行判断