What is the different of "<b>may</b>" and "<b>might</b>"?<br/><br/>Which one should I use here?<br/><br/>"<b>I <u>might</u> not be able to come at 4:00</b>."<br/><br/>"<b>I <u>may</u> not be able to come at 4:00</b>."<br/><br/>Can anyone help to explain to me?<br/><br/>Thank you!