Write down what the students were doing when the teacher came in.

1) Max / stand / at the door.

2) Anna and Alice / discuss / the new film.

3) Mark / learn / a poem by heart.

4) Helen / read / a text book.

5) Two girls / write something / in their notebooks.

6) Oliver and Tim / make fun / of John.

7) Alex / look for / a pen / in his bag.

1) Max was standing at the door. 2) Anna and Alice were discussing the new film. 3) Mark was learning a poem by heart. 4) Helen was reading a text book. 5) Two girls were writing something in their notebooks. 6) Oliver and Tim were making fun of John. 7) Alex was looking for a pen in his bag. В данном случае используется время Past continuous. Для его образования нужно поставить вспомогательный глагол to be в прошедшее время: was (для I, she, he) и were (для you, we, they) и после причастие (Paticiple I) смыслового глагола, которое образуется путём добавления окончания - ing к основе. В примерах two girls, Oliver and Tim, Anna and Alice эквивалентом является местоимение they (поэтому используем were), Алекс -, Max, Mark - he, поэтому используем was.