Поставьте следующие предложения в прошедшем и будущем времени , изменив соответственно обстоятельство времени?
1)Our students are given a lot of homework to do every day.
2)what kind of books are discussed in class?
3) Comrade Ivanov is often asked to translate articles from English into Russian.
4)How many houses are built in our city a year?
5)Why aren't these exercises done?

1) Our students were given a lot of homework to do yesterday. 2) What kind of books were discussed in class? 3) Comrade Ivanov was often asked to translate articles from English into Russian. 4) How many houses were built in our city last year? 5) Why weren't these exercises done? 1) Our students will be given a lot of homework to do tomorrow. 2) What kind of books  will be discussed in class? 3) Comrade Ivanov  will be asked to translate articles from English into Russian. 4) How many houses  will be built in our city next year? 5) Why won't these exercises be done?