Suppose, after spending all day repairing my motorbike I go to a cafe to meet my friend. I am looking so tired. So, my friend asks me why I am looking tired. When he asks me that, with which of the following sentences I should reply to him? I mean which tense I should use.
1- I am tired because I have been repairing my motorbike all day.
2- I am tired because I have repaired my motorbike all day.
3- I am tired because I repaired my motorbike all day.
4- I am tired because I was repairing my motorbike all day.
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