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I watched TV an hour ago I will watch TV on Wednesday I am watching TV at the moment My sister studied music three weeks ago My sister will study music next month my sister is studying music at present Pete learned an English poem by heart yesterday Pete will learn an English poem by heart in a week Pete is learning an English poem by heart now My granny wrote a letter to her friend in 2016 My granny will write a letter to her friend tomorrow My granny is writing a letter to her friend at the moment