с сочем 1 вариант, 6 класс очень

Task 2

1. is having, isn't swimming

2. are you doing, am reading

3. isn't playing

4. is travelling

Task 3

You mustn't use your phone

You must the listen the librarian

You mustn't run

Объяснение:

вроде все правильно

 If we planted more trees, we ... in a fresh area. 2) would live - второй тип условного предложения - Если бы сажали больше деревьев, мы бы жили на чистой территории. (территории со свежим воздухом имеется ввиду)

If the people walked more, they ... healther  3) would become - второй тип условного предложения - Если бы мы больше гуляли, мы бы стали более здоровыми.

If people hadn`t invented machines, the environmental problems ... . 3)wouldn`t appear (я бы сказала wouldn't have appeared по третьему типу, потому что в придаточном предложение Past Perfect, но такого варианта нет, поэтому я осмелюсь предположить, что это смешанный тип условного предложения) - Если бы люди не изобрели машины,  проблемы с окружающей средой не возникли бы.

My name is Sergey. I’m thirteen years old. Everybody must have an ardour for something or an activity he likes to do in a free time. My hobby is collecting stamps. In the childhood my father collected stamps too. I liked his collection very much and I decided to carry on the tradition. My father helped me to begin collecting stamps. He had several repeated stamps and he gave me them. Also my grandmother found several old envelopes and gave me the stamps. I joined a club of stamp collectors and made new friends who have the same hobby. Now I can exchange stamps and discuss our collections. All my stamps are kept in the special albums. They are divided into different themes. I have a lot of stamps with images of flowers, plants and famous people. I like my hobby.