The most frequently used english

Today's trivia....What is the most frequently used english phrase in the US, at least according to my english teacher? ........

"I'm tired."

Yesterday I was stupid.
I wrecked my bike.
But my bike is okay.
I scraped my kneed and my finger.
I am wearing 4 bandaids now.
I still had to bike to school.
I'm tired.
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