he was not sure if he could walk so far use doubtful
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He was doubtful if he could walk so far.
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Answer :
The given sentence 'He was not sure if he could walk so far.' can be rewritten using the word 'doubtful' in the following manner :
He was doubtful if he could walk so far.
Cambridge English Dictionary defines 'doubtful' as 'f you are doubtful about something, you are uncertain about it: The teacher is doubtful about having parents working as classroom assistants.'
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