he was reading when his mother came back.→He _____ _____reading when his mother _____back home.1)
问题描述:
he was reading when his mother came back.→He _____ _____reading when his mother _____back home.1)
1)改为否定句
→_____ he reading when his mother_____back home?(改为疑问句)
答
was not came
was came