To express prediction, expectation and assumption, the following auxiliariesA helping verb used with main verbs to express mood, voice and tense. E.g.: I can't stand when I am disturbed. ("can", "am") are used.

"The phone's ringing." "That'll be for me." (assumption)
I think it will rain tomorrow. (prediction)
He should be at home by now. (expectation)
He ought to be at home by now. (expectation)

Modals expressing past "prediction" / expectation / assumption
Prediction / expectation / assumption with modals Requests with modals

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