Everybody knows
Old is old and Shoe is shoe
Then you know "Old shoe."
What does that mean? "Old shoes"?
Of course not!
What does that mean?
Let's learn together.
Old shoe ≠ old shoes
In fact, the complete expression of this sentence is: As common as an old shoe, which is a slang phrase commonly used by crooked nuts, indicating: do not put up a shelf; approachable.
例句：Although he is a famous writer, he is still as common as an old shoe.
Although he is a famous writer, he is approachable.
How do you say "shoes grinding feet" in English?
Do you know how to express "shoes grinding feet" in English? It's simple and can be used: Rub rub; rub; scratch.
例句：The back of my shoe is rubbing.
My shoes grind their heels.
Old hat ≠ old hat
In fact, "Old hat" means: old-fashioned; old-fashioned; outdated.
例句：Today's hits rapidly become old hat.
What is very popular today will soon become obsolete.
Have you learned?
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