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"was good at" is correct and usable in written English.
You can use it when you are referring to someone's ability or talent. For example, "My grandfather was good at playing the piano."
Dictionary
was good at
adjective
Acting in the interest of good; ethical. of people
Exact(59)
Rizzo was good at that.
I was good at that".
I was good at it".
He was good at it.
I was good at math.
She was good at it.
I was good at things.
He was good at that.
"I was good at school," she writes.
My dad was good at spotting elk.
Similar(1)
"He's good at everything".
Write better and faster with AI suggestions while staying true to your unique style.
Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com