改成一般疑问句 My friend has bought a large house.

真是服了这帮人了,学过英语没有.
has这里是助动词,当然要放在开头.只有当做“有”的意思,作实动词才用does.
Has my friend bought a large house?话说这不是现完吗是啊。改成一般疑问句的原则：有be动词就be动词提前，助动词就助动词提前，没有的话用do或does。