+173.+ _May_ used as a helping verb means present permission in regard
to an action or possession, as:
You may come with us.
He may have the money.
+174.+ It may also mean a possible action or possession. _You may come
with us_, for example, might mean that some time in the future it is
possible that you will come with us. _He may have the money_, might mean
either _He is given permission to have the money_, or _It is possible
that he has it_.
_May_, used with many verb forms, means _it is possible_. For example:
_He may be hungry_, _He may have starved_. _He may have been starving_;
that is, it is possible that _he is hungry_; that _he has starved_; that
_he was starving_.
+175.+ _Might_ is the past form of _may_ and expresses past permission
to do or to be and also possibility in the past. For example: _The
officer said he might go_. That is, he gave him permission to go. _You
might have helped your comrades_; that is, _you had the power to have
helped_.
_Might_ is also used to express permission or the power to do in the
present and future, on condition. For example:
He might find work if he were trained.
The workers might destroy this insane system if they would.