[ Past with Modals ]
He might have been at the gym during that time.
A. He was definitely at home.
B. He could not have been at the gym.
C. He was probably at work.
D. He was possibly at the gym.

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“I am sorry I tore your trousers,” said Joseph. (apologise)
A. Joseph apologised about tearing my trousers.
B. Joseph apologised to having torn my trousers.
C. Joseph apologised for tearing my trousers.