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？

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？
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？

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？
"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.

后面说了在去日本之前，就应该用过去式。