disapproval or reproach
E.g. You might carry the parcel for me. You might have helped me.
Here we find only the form might used in affirmative sentences and followed by the simple of Perfect infinitive. In the latter case it expressed reproach for the nonperformance of an action.
The form might which expresses unreality is not always parallel to may. Might expresses unreality only in combination with the Perfect infinitive.
E.g. You might have let me know about it beforehand.
There was a car accident in front of our house. Luckily Tommy was at school. He might have been killed.
In most cases might is used as a milder and more polite form than may of as a form implying a greater degree of uncertainty:
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