5. 1) I could talk when i was two.
2) My friends couldn't go to the disco.
3) Could you speak English last year?
4) I could ride a bike two years ago.
5) Could you play chess ten years ago?
6. 1) You should play a game.
2) You shouldn't open the window.
3) You should buy a drink.
4) You should have a sandwich.
5) You shouldn't play computer games all night!