he was watching tv when his mother come back home用i don't know变宾语从句
问题描述：
he was watching tv when his mother come back home用i don't know变宾语从句
答
所谓变宾语从句,就是让这句话做i don't know的宾语
i don't know (that) he was watching tv when his mother come back home.
还有你好像写错了吧,应该是he was watching tv when his mother came back home.前后时态要保持一致.