Mary doesn't have two big eyes.
改否定句行为动词是三单时，把助动词doesn't放在行为动词前面，行为动词变为原型，如果有ofen,usually等词时，放在这些词的前面。
Mary does't have 2 big eyes.
（mary是三单，改成否定就要加助动词doesn’t，后面的has就要改成原形）
Mary doesn't have two big eyes
Mary doesn't have two big eyes.
Mary don't have big eyes.
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