could or couldn't?
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2) couldn't

3) couldn't

4) couldn't

5) couldn't

6) could

7) couldn't

Объяснение:

2. Timur couldn't win the medal because he fell down

3. We couldn't play football outside because the weather was rainy.

4. My mum couldn't play tennis before, but now she plays well.

5. Samat couldn't ski well, he always fell down.

6. Pete could dance all dances, he was a star at the party!

7. I couldn't write my report because my computer was broken.

Удачи!