- - You could certainly say this if the other person had asked you to do something as a favor . If it was your boss who asked you to do some work, however, this might be considered facetious or lackadaisical. A serious, sincere response in that case will require an apology and some explanation of exactly why you were unable to complete the task: ' I'm sorry, but I have run into difficulties with Project B, and haven't yet been able to finish your assignment yet.
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