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Have you to go to the dentist’s this morning？（你今天上午要去看牙齿吗？）
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如系指经常的或习惯的活动，就说：
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Do you often have to go to the dentist’s？（你经常要去看牙齿吗？）
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在以上两种情形不一定要正式的疑问句才行，请参看下例：
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You haven’t to go to school today，have you？（特殊）
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You don’t have to go to school on Sundays，do you？（习惯）
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在口语中常将 have got to 代替 have to 用：
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What have you got to eat？（特殊）
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What do you have to eat？（习惯）
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He hasn’t got to work.（特殊）
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He doesn’t have to work.（习惯）
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在会话时，尤其是在美国，常将 have 省去，只说 got，如： I got to （=must）write a letter.
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又“have to”的过去有下列各种表现：
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had to（肯定）
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did you have to
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had you to
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had you got to
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（疑问）
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didn’t have to
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had not to
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（否定）
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但 had got to 只有英国人说，美国人是不这样说的。
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英文疑难详解 88．It is…that…should 中 should 的含义
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