Today's math class was good! Some classmates ran around the playground because they didn't correct thier erros in the homework. And a classmate forgot to bring the textbook, so he needed to sing a song. We only learned math for 10 minutes! Haha.
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The above are my student's daily jottings. Is the last sentence acceptable to native speakers?
Today's math class was good! Some of my classmates had to run around the playground because they didn't correct their errors in their homework. And a classmate forgot to bring the textbook, so he needed to sing a song.
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Today's math class was good! Some of my classmates had to run around the playground because they didn't correct their errors in their homework. And a classmate forgot to bring the textbook, so he needed to sing a song. We only studied / did math for 10 minutes! Haha!
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classmates is not wrong, but I