I didn't go downstairs until the window had to be shut”变强调句
问题描述：
I didn't go downstairs until the window had to be shut”变强调句
答
1)强调句在谓语动词前加do/does/did
I did go downstairs when the window had to be shut!
2)用形式主语it来强调
It was the time the window had to be shut that I went downstairs.
第二句比较怪,最好用第一种