Question

изменить предложения в :Present Simple, Past Simple, Feter Simple , Present Pragressive, Present Pafect . 
  1 they buy apples every day 
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2 Dima wolked his dog yesterday 
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Oleg has alreay barnt the words 
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Answer 1

1) They buy apples every day.
Past Simple: They bought apples yesterday
Future Simple: They will buy apples tomorrow.
Present Progressive: They are buying apples now.
Present Perfect: They have already bought apples.  

2) Dima walked his dog yesterday
Present Simple: Dima walks his dog every day.
Future Simple: Dima will walk his dog in the evening.
Present Progressive: Dima is walking his dog now.
Present Perfect: Dima has already walked his dog.  

3) Oleg has already learnt the words
Present Simple: Oleg learns the words every day.
Past Simple: Oleg learnt the words last week.
Future Simple: Oleg will learn the words next week.
Present Progressive: Oleg is learning the words at the moment.