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Which part of the following sentence contains an error ?

He knew (a) that he will (b) go back (c) on his promise (d).

  • A.He knew (a)
  • B.that he will (b)
  • C.go back (c)
  • D.on his promise (d)

Answer: B

The error is in part (b), 'that he will'.

The main verb 'knew' is in the past tense, so by the sequence of tenses the reported clause must also shift into the past: 'will' becomes 'would'. The correct sentence is 'He knew that he would go back on his promise.'

Part (a), 'He knew', is correct. Parts (c) and (d) form the idiom 'go back on one's promise', meaning to fail to keep it, which is correctly used with the preposition 'on'.

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