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Modal verbs They can express ability, possibility, need or other condition.

- - - - I can’t speak Japanese.
      - You can’t speak German.
      - He can’t speak Swahili.
- - - - I do not have to eat
      - I do not have to work
      - I do not have to clean my house
- - - - She must be back by noon.
      - She must take the children with her to Houston.
- - - - I have to do my homework
      - I have to wash my car
      - I have to walk my dog
- - - - I can speak English.
      - You can speak English.
      - He can speak English.