Principals Don't Desert Their Principles
Mr. Thomas is our principal/principle.
Principal
Whose/Who's your best friend?
Who's
Mary and I/me have been friends since kindergarten.
I
Karen's friends chose to desert/dessert her at the mall.
desert
Whose
Its/It’s his backpack.
It's
desert
With who/whom will you attend the party?
whom
their
The dog lost it's/its collar.
its
dessert
Jenny decided to vote for the person who/whom she felt would be the best leader.
whom
Seeing all their friends after so many years had an overwhelming affect/effect over them.
effect
I
He is the one who/that is speaking.
Who
The event affected/effected them in a positive way.
affected
Jake was in the same class with Mary and I/me.
me