为什么用一般过去式?
问题描述：
为什么用一般过去式?
has your husband returned from shanghai yet?
Yes,but he ______at home for only three days before he went to jepan on business.
用was为什么?
去日本是went 之前不是过去的过去吗？
答
"before he went to Japan on business"这个时间状语从句告诉我们“去日本是一个过去动作”,
“呆在家里”在“去日本”之前,所以用过去时!
温馨提示：
for three days往往用于现在完成时,有时也可以用于过去时.真如此例.再举一例：
He stayed in Chengdu for only one night in September 2008.