Ответ:
1.The task was difficult, so girls couldn't do it.
2.This jacket isn't warm, to wear this in the winter
3.the back seat isn't wide Because of this they can't sit .
4. The little puppy isn't clever, so it can't do this trick
5. The skirt isn't long enough because of this she can't wear
6. The market is very far away to walk
7. He is young to drive a car
8. They are slow maybe they can't win the game.