you don't have to buy a gift一句中have to做情态动词吗?buy作为实意动词,那么have to是情态动词吗?如果是的话为什么是don't have to而不是haven't to

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you don't have to buy a gift一句中have to做情态动词吗?buy作为实意动词,那么have to是情态动词吗?如果是的话为什么是don't have to而不是haven't to
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you don't have to buy a gift一句中have to做情态动词吗?buy作为实意动词,那么have to是情态动词吗?如果是的话为什么是don't have to而不是haven't to
you don't have to buy a gift一句中have to做情态动词吗?
buy作为实意动词,那么have to是情态动词吗?如果是的话为什么是don't have to而不是haven't to

you don't have to buy a gift一句中have to做情态动词吗?buy作为实意动词,那么have to是情态动词吗?如果是的话为什么是don't have to而不是haven't to
have to 是一个比较特殊的情态习语,表示外界的强制作用,含有不情愿的色彩,常译为“必须,不得不”.可用于多种时态,而且不同时态使用不同的形式.否定式和疑问式一般要借用助动词do的适当形式构成.