Одна составляющая не совсем ясна. Вспомни формы Past Simple глагола to be. Professor ... here ten days ago. I...In London last week. We...at school yesterday. He... at the airport yesterday.

Глагол to be в прошедшем времени Past Simple имеет форму was для единственного числа (I, she, he, it) и форму were для множественного числа (we, you, they) и 2-ого лица единственного числа (you).


Professor was here ten days ago. I was in London last week. We were at school yesterday. He was at the airport yesterday.