HE, SHE, HIM, HER, YOU, ME AND I...

HE, SHE, HIM, HER, YOU, ME AND I...
Written specifically for my great-grandchildren and their friends ... for reference some day, when they reach their teens.

WHY is it that people who have no trouble with these pronouns when only one individual is involved, suddenly go into a tailspin when a second person has to be included?

It’s so simple! Just think in the singular, then insert that someone else into the expression and you can’t go wrong.

Here are some examples:
This is the present someone gave ME.
This is the present someone gave Mary and I? - No! ... The ME should remain in Mary and ME, not Mary and I! (You’d never say someone ‘gave I’, so why would anyone now want to change that ME to I??)

HIM and his wife are going.
This should be: HE and his wife.

HER and her husband are going.
TOTALLY INCORRECT!
This should be: "SHE and her husband."

WHY?
Remove the second person from the equation and you’ll see. – Would you say, “HER is going”, or "HIM is going?"