Used he to play the piano?回答

Used he to play the piano?回答
用Used he to play the piano?问,怎么回答呢?是不是Yes,he used to be.No,he used not to be.这样的回答太长了啊?还是Yes,he used.No,he used not.

问句应该是,did he use to play the piano?这样才是我见过的.
yes,he did.
no,he didn't.
再问： 你说的这个事比较常用的问法，我说这个不太常用，因为觉得别扭，但是要给孩子讲，还是需要
再答： 那你就说 Yes, he used to No, he didn't use to 肯定没错，得带to，但后面的动词可省略
再问： 好，我知道了，谢谢了 不过否定回答应该是No，he used not to吧
再答： 嗯。你说的有道理。我帮你查了下，结果如下： Used not to is called "formal style" by Michael Swan (a British writer) in Practical English Usage, 2e (Oxford University Press, 1995). He lists "didn't use to" as an informal style. The second entry for used to in The Collins COBUILD English Dictionary (HarperCollins, 1995) includes these words: "If something used not to be done or used not to be the case, it was not done in the past or was not the case in the past. The forms did not use to and did not used to are also found, especially in spoken English." Quirk et al. (A Comprehensive Grammar of the English Language, Longman, 1985 p.140) lists "He usen't to smoke" and "He used not to smoke" as preferred by many in British English," and "He didn't use to smoke" and "He didn't used to smoke" used by both British English and American English speakers. Another British writer, L. B. Alexander, in Longman English Grammar (Longman, 1988), states in this first line of his explanation that used to may be formed without the auxiliary "do" as in "You used not to smoke." But he adds that didn't is more commonly used to form negatives with used to. Alexander also states that "We can avoid the problem of the negative by using 'never..' 'Fred never used to be so difficult.' " If the negative of used to is a problem, the insertion of "never" is a way to solve it. However, since you asked, The Grammar Exchange does not think that the negative of used to is a problem. Either the "formal" or "British" used not to is fine, as is the "informal" or "American" didn't use to (or didn't used to).