陈述句改疑问句The Russians and Germans have built a new Amber Room at the summer palace.By studying old photos of the former Amber Room.改成两个疑问句1.Who built the new Amber Room?2.What did they built the new Amber Room by?帮我看看有没有语法错误或者意思不对的地方?有倒是说啊！别捣乱

有

第1个句子没什么问题.
第2个不太地道,可以简单的改为:
How did they built the new Amber Room?
如果一定要强调"利用什么来建造"这个意思的话,可以说:
By what did they built the new Amber Room?
不过这样其实也不是很地道...稍微好一点儿
如果题目只是要求改成疑问句,还有个:
What have been built by the Russians and Germans at the summer palace?

Who built the new Amber Room？
从口语角度没有问题
但正式一点的话应该是 Who did build the new Amber Room？

对
没什么错误.

你原句是现在完成时态,建议第一个问句也用完成时态.
第二个问句是提问"通过什么方式的",不用what by,直接用"how"
修改为:
1.Who have built the new Amber Room?
2.How did they build the new Amber Room by?