When the subject and object of a sentence are the same, we have to use reflexive pronouns.
What does that mean? If you have I and me in the same sentence, you have to change the me to myself. And if you have you twice in the sentence (one as the actor and one as the recipient... but the same person), the object becomes yourself.
I taught myself how to play the piano.
You should introduce yourself to him.
He plays tennis by himself quite often.
She made herself a pizza.
We were dirty so we had to wash ourselves before going out.
They fed themselves leftovers from yesterday.
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