Put the next modal auxiliaries in the past tense. You may not use any forms with 'able'.

1. I have to be at home by midnight.
Past: I be home at midnight.

2. My father can't be Zorro. He can't ride on horseback.
Past: My father Zorro. He on horseback.

3. You may not feed the animals at the farm.
Past: You feed the animals at the farm.

4. She may still phone this evening.
Past: She still that evening.

5. George Junior, you must eat your spinach!
Past: George Jr. eat his spinach.

6. You don't need to clean the whole house.
Past: You the whole house so you shouldn't be ashamed that you didn't do so.
Past: You the whole house, but I'm grateful tha tyou did so.

7. Ross might send Rachel some flowers.
Past: Ross Rachel some flowers.

8. She must be cheating on her husband. She is never at home anymore and she's behaving very strangely.
Past: She on her husband. She was never at home anymore and she was behaving very strangely.

9. You should never drink Baileys and gin together.
Past: You Baileys and gin together.

10. She can play the guitar.
Past: She the guitar.

My uncle once (in Dutch kon, past ability) swim across the Channel.

11. He will be in Venice now.
Past: He in Venice last year.

12. She couldn't be my mother's niece. She's far too old.
Past: She my mother's niece. She was far too old.

13. She may use our car.
Past: She our car.

14. You can stay home tomorrow.
Past: You home tomorrow.

15. It's incredible, but Hercule Poirot may be wrong.
Past: It seemed incredible, but Hercule Poirot wrong.

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