1) They could write and read books.
2) They couldn’t fly planes.
3) They couldn’t watch television.
4) They couldn’t travel by train.
5) They could ride horses.
6) They could travel by sea.
7) They couldn’t drive cars.
8) They couldn’t ride bikes.
9) They couldn’t play computer games.
10) They could make houses.
11) They could cook food in the kitchen.
12) They couldn’t listen to CD players.
13) They could play chess.
14) They couldn’t speak on the telephone.
15) They couldn’t eat cheeseburgers and drink Coke.
