Question

请问下哦,How long does he stay here?与How long has he stayed here

Answer 1

区别在于第一句不正确.

这个句型无法以一般现在式表达.

要嘛已经来过又走了,那就用 has he stayed 完成时.

要嘛他还没来,可以用未来时 How long will he stay here.

此外,如果现在他正在这儿,不确定待多久,可以问 How long will he be staying here.或 How long is he going to be staying here.

除此之外其他的时态都不合适.