Mark is ten years old.He's on the four grade.这个Mark is ten years old.He's on the four grade.这个句子哪两处是错的?

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Markistenyearsold.He''sonthefourgrade.这个Markistenyearsold.He''sonthefourgrade.这个句子哪两处是错的?Markistenyear

Mark is ten years old.He's on the four grade.这个Mark is ten years old.He's on the four grade.这个句子哪两处是错的?
Mark is ten years old.He's on the four grade.这个
Mark is ten years old.He's on the four grade.
这个句子哪两处是错的?

Mark is ten years old.He's on the four grade.这个Mark is ten years old.He's on the four grade.这个句子哪两处是错的?
year grades