To express past expectation and assumption, the same 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 in the case of present expectations and assumptions. However, the infinitives that follow are perfectThe aspect expressing completion. E.g.: He’s finished university. infinitives.

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.

We use the future simple tenseA grammatical category that is marked by verb inflection. To express when an event or action happens in time or when a state exists, we use tenses. to express a subjective prediction, which is a hypothesis based on opinion or intuition. Whether or not the eventA general term expressing that somebody or something does something or that something happens. E.g.: An apple fell on Isaac’s head. will happen or not is not certain. Very often this kind of prediction is introduced by I think/I don't think.

Going to is used to predict future eventA general term expressing that somebody or something does something or that something happens. E.g.: An apple fell on Isaac’s head.s which are very near. This use is impersonal, i.e. independent of the speaker's opinion. There is usually a sign of the future event in the present.