We are almost sure sth is true about the present, They must be very well-off - they've got a huge house., There's a light in his office. He must still be working., He must work really hard. He never gets home before 9 p.m., We are almost sure sth is true about the past, You must have seen him - he was standing right in front of you., We are almost sure sth isn't true about the present, They can't be playing very well - they're losing 0-3., We are almost sure sth isn't true about the past, You can't/ couldn't have spent very long on this essay - youэму only written 100 words., We think it's possible that sth is true in the present, I haven't seen the Sales Manager today. He may/might/ could be off sick., We think it's possible that sth is true in the past, The keys of the store cupboard have disappeared. Do you think someone may/ might/ could have taken them?, He may/ might not have heard the message I left., We describe a situation we expect to happen, If I post the letter today, it should/ ought to arrive on Friday., We describe a situation we would expect to have happened in the past, I posted the letter a week ago. It should/ ought to have arrived by now.

4A Deduction and speculation

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