Could - couldn't

Gap-fill exercise

Fill in all the gaps, then press "Check" to check your answers. Use the "Hint" button to get a free letter if an answer is giving you trouble. You can also click on the "[?]" button to get a clue. Note that you will lose points if you ask for hints or clues!
Could or couldn't ( Simple Past )

John can play the piano. He play it when he was six.
Anna can swim since last week. Last August she swim at all.
I win the first game, but I win the second one.
you ride by bike when you were three years old? No, I . But my brother .
They understand why they lost their jobs.