Whether requires a choice between two or more alternatives - expressed or implied. You can't have whether combined with because - the choice is still undecided. Your clause has a result of a decision and a reason for it - not an open choice...
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jooneySo the "whether test" that I tried the other day should have been constructed as follows: Whether they didn't accept the offer because they were being cautious or because the price wasn't good enough or for some other reason puzzles me. Here you take it for granted that they didn't accept the offer and wonder about a reason for the refusal.I'm not famil
Anonymous However, the word, "puzzle," as a verb, is rarely used in EnglishI respectfully disagree. - A.