按要求改变句子.看下面
问题描述：
按要求改变句子.看下面
1.They were walking slowly.(改为否定句）
2.We were digging a hole.(就线部分提问)
3.He worked slowly because he was tired.(就画线部分提问)
4.Was he singing a song?
答
They were not walking slowly.
What were you doing?(猜划线部分是digging a hole)
Why did he work slowly?(猜划线部分是because...)
第四题实在看不懂.不知道你想怎么变