можно if: May I ask you whether you like classical music?, Do you know whether this story has a happy ending?, Ask your friend whether he will be able to join us for supper., Mark asks whether we are ready to begin the discussion., только whether: They were not certain of whether the task would be too hard for them., The girl is still thinking whether to marry him, Whether the day is warm or not, we are planning to spend it outdoors., I still don't know whether or not he is planning to come. , We are in two minds about whether or not we should take he invitation., The problem is whether or not we have visitors from abroad.,

if or whether

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