Modals are can, could, may, might, must, ought to, shall, should, will, would and need (need can also be a main verb).

• We can play football.
• We could play football.
• We may play football.
• We might play football.
• We must play football.
• We mustn't play football.
• We needn't play football.
• We ought to play football.
• We shall play football.
• We should play football.
• We will play football.
• We would play football.