I do not know how to ask someone to be frank. Actually I have request from someone and I want to send an email to ask whether he would do it for me or not.
closed as too broad by Tyler James Young, hjpotter92, Mistu4u, chrylis, WendiKidd Oct 5 '13 at 15:49
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Please be frank.
Sometimes, the direct approach is the best :)
Or, if you want to mealy mouthed, "I don't want you to be afraid to answer. Please tell me honestly how you feel."