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I ________ a letter to Laura yesterlay
I ________ a letter to Laura now
I_________ write a letter to Laura tomorrow
I ________ to write a letter to Laura on Sunday
I am _______ a letter to Laura in the evening
I________ a letter to Laura for half an hour yesterday
I_____ two letters to Laura this week
I_______ letters to Laura since 2004
I______ a lot of letters to Laura
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I wrote a letter...I writing a letter...I am going to/will write...I am going to write...I am going to write a letter...I am going to write...I wrote two letters...I been writing letters...I had written a lot...