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Can you please help me to identify the error in these examples of a chinese second language learner?
I saw a few movie.
You like hamburger, isn't it?
Today, I mow grass, and you clean dog house.
I think the error is semantics, Am I correct?
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This isn't homework, is it? No, the errors are just grammatical:

I saw a few movies.
You like hamburger(s), don't you?
Today, I ('ll) mow the grass, and you clean the dog house.