有读者问：在Oxford Progressive English Course (Book Two)中有这样一个句子：
(1)Her father gave us this house as a wedding present, so we haven't to pay rent.
是否有 haven't to ... 这样的说法？是否应将 haven't to 改作 don't have to?
haven't to 并不错，在《牛津现代高级英语学习词典》（Oxford Advanced Learner's Dictionary of Current Engish ）中即有这样的句子：
(2)You haven't to go to school today, have you? （也可以说 haven't got to）
haven't to 与 don't have to 在意义上没有什么区别，只是前者只用在英国，后者则原只用在美国，但现在亦可用在英国了。英人夸克（R. Quirk)等编著的《英语语法大全》（A Comprehensive Grammar of the English Language ）对下列两个句子进行了比较：
(3)Do we have to get up early tomorrow?
(4)Have we to get up early tomorrow?
接着他指出句（3）中的“Do we have to...” 在英、美两国皆通用，但句（4）中的“Have we to” 则只用在英国，并说已颇为古旧了。我们认为这样的比较也适用于 haven't to 与 don't have to。
