Modal verbs for speculation

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It’s more than likely that he didn’t see the exit sign. (CAN'T)

He can't have seen the exist sign

It isn’t necessary to buy tickets for the match in advance. (NEED)

You don't need to buy tickets for the match in advance.

It is probable that Tom was using his mobile phone when he had the accident. (WELL)

Tom may well have been using his mobile phone when he had the accident.

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