Complete sentences a-d with needn't or needn't have and the correct form of the verbs in brackets.
a. 'I stayed up late revising, but when I saw the exam paper, I realised I..........(worry).'
b. 'You..........(pay) anything now. A bill will be sent to you in due course.'
c. 'Apparently fans..........(arrive) early for the concert - there will be plenty of available seats.
d. 'We..........(spend) all that time looking for a bank - there was a cash machine here!'
