I'm sure you'll agree that there's nothing wrong with 'I've been painting the fence since yesterday'. Likewise, I see nothing wrong with your original sentence (though it does sound a bit casual to my ears). While you can certainly rewrite it as 'I've been painting the fence since I started it two weeks ago', the 'I started' part seems redundant.
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Guren FirippuI'm not sure though if songs are always grammatically incorrect,Many songs are grammatically correct.
hsin10414451I really can't find clear enough answers on a textbook myself and I'm really getting a headache..We have discussed this topic before in EnglishForward. Here is a recent discussion:
hsin10414451My manager refuses to see references from the internet...The Google ngram site lets you search on published books in the English language. It demonstrates (by real evidence) how writers use the English language. Textbooks will not be as thorough. Language changes over time, so old textbooks go out of date with current actual language usage.