英语时态问题We have learnt quite a lot about it since we came here

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英语时态问题
We have learnt quite a lot about it since we came here.
为什么主句用现在完成时,从句用过去式?
能否把句子改成：
we have learnt quite a lot about it since we come here.
或
we hade learnt quite a lot about it since we came here.

一、现在完成时表示的是过去发生的行为造成说话时对现实情况的影响,比如说过去打开的门到说话时依然敞开着,就需要用 The door has been opend 来表达.
二、since 意思是“自从过去某个时刻以来”,而过去时态 we came here 恰恰表示的就是这个过去时刻；如果改为现在时态,意思是成了从此刻以来,既然是时空为零距离的此刻,怎么会“以来”呢?这是不合情理的逻辑错误.
三、对 We have learnt quite a lot about it since we came here 的进一步解释.
主句 We have learnt quite a lot about it 其含义是：关于这件事,我们从过去开始learn,由于 learn,以至于我们目前 learn 到了许多.
从句：since we came here 意思指：从过去的什么时间 learn 的呢?从我们当是到了这里开始的.

our school changed a lot since we came here..对a lot 提问解释一下该句子的时态Since he came here last year, we have been happy.解 It is just a week----------- we came here.填什么a:since B:until 这个英语单选,选哪个we have all learnt a lot from the ＿course A.three- came China since to we have used life here we been the to 怎样 we lot a about music learnt这个连词组句怎么做? We've already learnt a lot about Chinese culture and history We have learnt English____three years.是since还是佛如? Scientist have learnt a lot ----the kinds of food we should how long have you( it"s about ten years since we( ) a marrie It's about three years since they＿here.是填came还是have been? we have lived here _ we came here in 1986