E5. We 'might as well' do something = We should do it because there is no better alternative. There is no reason not to do it. May as well is also possible. (e.g. A: What time are you going out? B: Well, I'm ready, so I might as well go now.)
E6. We make questions by putting the subject after 'may/might'. (e.g. May I ~ ? Could I ~ ? Might I ~ ? etc.)
a. The negative forms are 'may not' and 'might not' (or mightn't). (e.g. It may not be true. (= perhaps it isn't true))
b. to make polite requests: May I borrow the car tomorrow?
c. When we use 'may not' for a refusal it is emphatic: You may not!
Idiom 365
Kill Two Birds with One Stone: to accomplish two different things at the same time
Example: Walking to work kills two birds with one stone. It saves money and gives your health life.