Can we make a prediction about the future using "can't" and "must"? For example, "we can't be late, we've got now plenty of time to get there". " She must be really happy when she learns about your new job". Thanks in advanve :)

1 Answer 1


Neither of your sentences is idiomatic.

We can't be late would usually mean 'we must not risk the possibility of being late' You might say We can't possibly be late now, we have plenty of time to get there.

She must be really happy would mean 'she is certain to be happy now'. As a prediction, you would have to say She will be really happy.


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