Допоможіть будь ласка скласти речення з неправильним дієсловом was щоб було у реченні

I was skateboarding yesterdayHe was playing computer games last year

1)I was watching TV when my mom came home.2) I was doing my homework while my mom was cooking.3) Today I was reading an interesting book for four hours.4)My teacher was shouting when the commission suddenly came into the class.