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Doubt, doubtful

Similar rules apply to the use of these words. When they are used in affirmative sentences, they can be followed by 'whether' - in formal speech - 'if' or 'that' - in informal speech. In negative sentences and questions doubt and doubtful should be followed by 'that'. Examples: I doubt whether he is coming versus informal: I doubt that/if he is coming and in questions: Do you doubt that he is coming?.

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2011-11-24 10:32:43
Larissa wrote:
Examples on DOUBTFUL also was supposed to be given, as it is written "similar rules apply to the use of these words. When they are used in affirmative sentences, they can be followed by 'whether' - in formal speech - 'if' or 'that' - in informal speech". Not everyone knows that there should be IT IS DOUBTFUL... (Assumption is based on readers' comments).

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