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 the earth.We live on the Earth. It is very,very big. There is a lot of water on the Earth.It is in rivers, seas and oceans. There are a lof of forest, fields mountains on it. Different animals live o0n the Earth. Different plants grow on it. The Earth is beautiful. There are large countries and small countries. There are warm countries and cold countris. In some countres there are four seasons in a year and in some countries there are two.  People live in different countries.  They speak different languages. Our country is not big. There are a lot of short rivers,large forests, fields and mountains in our country. 

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.