11)When mom I (to look )out of the window, the children (to play) hide-and-seek.
12)I(go) to the theatre yesterday.
13)At 7o'clock I (to go) to the theatre.

ой прости. сейчас напишу

when mom i looked out of the window,the children played hide-and-seekI went to the theatre yesterdayat 7 o'clock I went to the theatre