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严格地说,have to不是情态动词,只不过它后面也是加动词原形,为了方便理解,把它当作情态动词罢了.具体内容小编已经整理好了，一起来看看吧。
have to是不是情态动词
have to可以视为情态动词词组，但have to有时态和人称的变化，比如第三人称单数形式是has to，过去式是had to
You don't have to knock─just walk in.
不必敲门——进来就是了。
He has to apply for a permit and we have to find him a job.
他得申请一个许可证，而我们得给他找份工作。
I had to keep in with the people who mattered.
我得和管事儿的人保持良好关系。
have to的近义词
近义词介绍：oblige to
读音：[oʊˈblaɪdʒ tu; əˈblaɪdʒ tu]
表达意思：必须；不得不
例句：Mr. Oakley has always been ready to oblige journalists with information.
奥克利先生一直乐于提供信息帮助记者们。
But an incident, I replied, that may oblige you to become a resident again of these shores you avoid!
是偶然的事件，我又说，但它或者要使您重新做您不愿意做的陆上居民呢！