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Complete the sentences with the
affirmative or negative form of could,
can and will be able to. ​

1. l hope one day doctors will be able to cure all diseases.

2. When I was young, I couldn't speak English, but l can now.

3. l can't speak German because I've never had lessons.

4. l couldn't go to school yesterday because I was ill.

5. My brother is very clever. He could read when he was four years old.

6. No, we won't be able to transplant brains by 2020.