Has Ian sold his house yet? 伊恩把它的房子卖了吗? No,he haven't. 还是 No,he hasn't. 为什么?

问题描述:

Has Ian sold his house yet? 伊恩把它的房子卖了吗? No,he haven't. 还是 No,he hasn't. 为什么?

用后面那个; No,he hasn't.
因为 Ian 是三人称单数形式,相对应的助动词是has,而不是have.
而且问句用的也是 Has.