For and since Andrew is a very hard-working student. It's midnight and he is still working at his computer. Write sentences

Предлоги for и since являются формальными показателями времен групп Perfect и Perfect Continuous. 

For употребляется для того, чтобы ввести период, в течение которого происходит действие: He hasn\'t been eating properly for two weeks. Он не ест нормально в течение двух недель.

Since используется для указания времени, с которого действие началось: Andrew has been working on the computer since 8 p.m. Эндрю работает на компьютере с 8 вечера.  

1. Andrew hasn\'t had any fun for a long time.

2. He has had a cold for a week.

3. Andrew hasn\'t seen his friends for ages.

4. He hasn\'t been doing any sport since last year.

5. Andrew has been busy with his studies for months.