Question

It was not until she come back that I watched TV.是什么意思

Answer 1

直到她回来的时候我才看电视。
本句是强调句，所以看起来有点别扭。恢复一下就好了：
I did not watch TV until she came back.

希望能帮到您。

Answer 2

直到她回来,我看电视了。

有不明白的地方再问哟，祝你学习进步，更上一层楼！ (*^__^*)