He_ (teach) his son to ride a bike ​

Если Present Simple, то teaches

At the office he worked till two o'clock. At two o'clock he had dinner. He finished his work at seven o'clock in the evening. He decided to walk a little after his working day. He returned home at nine. He didn't want to have supper, he only dranks tea. Suddenly he remembered that he had to phone his friend. He dialed the numbers that he had to phone his friend. He dialed the number but nobody answered. His friend was not at home. He went to his room and decided to watch TV. When the TV programme was over, he slept.

At the office he worked till two o'clock.At two o'clock he had dinner.He finished his work at seven o'clock in the evening.He decided to walk a little after his working day.He returned home at nine.He didn't want to have supper,he only drank tea.Suddenly he remembered that he had to phone his friend.He dialed the numbers that he had to phone his friend.He dialed the number but nobody answered.His friend wasn't at home.He went to his room and decided to watch TV.When the TV programme was over,he slept.