问题描述：
teach改称第三人称单数是
teach（改成第三人称单数）___________
is（改成复数）______________
Mary goes to school on foot every day.(改为同义句）
Mary _______ _______school every day.
teach（改成第三人称单数）___________
is（改成复数）______________
Mary goes to school on foot every day.(改为同义句）
Mary _______ _______school every day.
问题解答：
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