YOU SAID:

I’m in math class doing work

INTO JAPANESE

私は数学の授業をしています

BACK INTO ENGLISH

I am teaching math

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私は数学を教えています

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I teach math

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数学を教えてる

BACK INTO ENGLISH

Math. I teach math.

INTO JAPANESE

数学を教えてる

BACK INTO ENGLISH

Math. I teach math.