He's learned English since he came here划线since he came here怎

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He's learned English since he came here划线since he came here怎么回答
原问是：
How___________ __________ he learned English
感觉上第二个空应该是have或者是had...

How long
再问：然后还有一个空。。。我把原句给你： How___________ __________ he learned English 感觉上第二个空应该是have或者是had...怎么看啊。。。
再答： long has
再问：为什么是has 什么时候用had= =
再答： He's表示是现在时，所以问的时候也表示现在学多久了，had是过去的过去，如果问他去年的时候已经学了多久就要用had
再问：多麻烦你一件事。。是一句连词成句，连下来后是： tihs year I had a wonderful time with my family on my birthday 别的感觉都是对的，但是tihs year我不确定，是放在最后还是在最前。。顺便说一下理由。。麻烦你了。。
再答：放在前后都可以。这两种用法都是可以的。我个人的话偏向于放前面。

I 've know him since he came here.(对划线部分提问since he came here He has taught here since he came here.一句中对"since he came her 1.（）He said he ___three English songs since he came here .A He told me that he had taught English since he came here. he has c___ a lot since he came here 关于英语1.He has _ us English since he came here.A.tahght B.teac It has been 3 years since he came here. peter __(not) make many friends since he came here i have known him since he came here He_eating American food since he came here.Aused toBhave bee It is about half an hour since he came here. Mike _______2000 Chinese words since he came here.