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Exercise on 'must not' and 'need not'

- must not - prohibition (it is not allowed)
- need not - option (it is not necessary)

Soccer Rules

Decide whether to use 'must not' or 'need not'.

  1. The teams have more than 11 players on the field during a match.
  2. But there even be 11 players playing for each team.
  3. Players wear anything which might injure another player.
  4. Players play the ball with their feet only.
  5. Substituted players return to the game.
  6. Players leave the game without the referee's permission.
  7. Players hold an opponent.
  8. The referee send a player off if he has committed foul play.
  9. However, if a player is sent off during the game, he be replaced.
  10. A period be over after exactly 45 minutes.