i doubt whether we will make a profit off of the project.请问off 在句中的含义和作用,

doubt 用法I doubt whether/ifI don't doubt thatThere's some doubt whetherThere's hardly/no/little doubt that I doubt that I don't doubt whetherI doubt that 和I don't doubt whether这两个句型对吧？ i doubt whether we will make a profit off of the project.请问off 在句中的含义和作用, i never doubt that… i doubt if/whether 都是什么意思阿i never doubt that…i doubt if/whether都是什么意思阿 We don’t doubt whether you will succeed为什么错 We never doubt ___David told us the truth,but we really doubt ___Daniel told us the truthA if whether B whether that C whether if D that whether I doubt whether Tom has taken my watch.去掉whether可以么?为什么要有 whether I don’t doubt whether I’m able to finish the work on time.改错 名词性从句i doubt whether he will come to see me .whether可否用that替代,为什么? 英语翻译Now,it is commonly believed that .They claim that ...But I wonder/doubt whether. I have no doubt后是接whether从句还是if从句或是that从句呀? The price _(go) down,but I doubt whether it will remain so . He is very clever.In fact,I doubt whether anyone in the class has__IQ i have no doubt whether he would overcome all his difficults请问有语法错误吗 the price has gone done ,but i doubt whether it will remain so. do you doubt()i believe you,that,which,whether,if,应该选哪个?求讲解 SAT 语法中doubt that 还是doubt whether? I have never doubted -----he will come today,but I do doubt-----he will come on time.A.that,that.B.whether,that.C.that,whether.D.whether,whether麻烦再翻译一下整个句子