关于doubt（怀疑）的用法doubt后面可以加特殊疑问词吗?如how?（我知道可以加if,whether之类的词）I doubt how to achieve it.可以这样说吗?

doubt 1
/ daut; daʊt/ n
[U, C] ~ (about/as to sth); ~ (as to) whether... (feeling of) uncertainty or disbelief 怀疑; 不确定; 不信任: There's some doubt about his suitability for the job. 他是否适合该工作有些疑问. * There is (no) room for doubt. （没）有怀疑的余地. * I have grave doubts about her honesty. 我很怀疑她是否诚实. * The latest scientific discoveries cast doubt on earlier theories. 科学上的最新发现使我们对以前的学说产生怀疑. * She had her doubts (as to) whether he would come. 她无法确定他是否来. * Although a very religious man, he is still troubled by occasional doubts. 他虽然笃信宗教, 但有时仍感到迷惘.
[U] ~ about sth/that. . . (used after negatives to emphasize conviction 用於否定词后以强调深信不疑) reason for not believing sth 不相信: There's not much doubt about it, ie It is almost certain. 那件事情没有什麽可疑之处. * I have no doubt that you will succeed. 我肯定你能成功.
(idm 习语) beyond a/any `doubt; beyond all (possible) `doubt certainly 无疑地: She was beyond all doubt the finest ballerina of her day. 她无疑是她那个时代最优秀的芭蕾舞演员. give sb the benefit of the `doubt => benefit. in `doubt uncertain; undecided 不肯定的; 不确定的: Their acceptance of the contract is still in doubt. 他们是否接受那合同还说不准. * If in doubt, don't, ie Don't act unless you're certain. 没有把握就不要做. ,no `doubt very probably 无疑地; 很可能: No doubt he means to help, but in fact he just gets in the way. 他确实是想帮忙, 然而事实上却只是帮倒忙. without (a) `doubt certainly 无疑地; 确实地: He is without doubt the cleverest student I've ever taught. 他确实是我所教过的学生中最聪明的. doubt 2
/ daut; daʊt/ v [I, Tn, Tf] feel uncertain (about sth); question the truth of (sth) （对某事物）无把握, 有怀疑: It is human to doubt. 怀疑是人的天性. * Do you doubt my word (ie think I am not telling the truth) ? 你怀疑我的话吗? * I don't doubt that he'll come, ie I'm sure he will. 我确信他会来. * I doubt whether he'll come. 我不敢肯定他来不来. * I doubt if that was what he wanted. 不知道那是不是他想要的. > doubter n.
# ,doubting `Thomas person who refuses to believe sth until he has clear proof 有真凭实据才相信某事物的人: She's a bit of a doubting Thomas she won't believe you're back till she sees you. 她是个眼见为实的人--除非她亲眼看见你, 否则绝不会相信你已经回来.

doubt既可用作动词,也可用作名词.现将其用法归纳如下.一、doubt用作动词1.doubt+名词或代词.例如：I doubt his word.我怀疑他的话.They doubted him before.他们以前曾经怀疑过他.2.doubt+宾语从句（1）在否定句和疑...