無疑的：Undoubtedly
例句：This is undoubtedly a magnificent work of scholarship.?
這無疑是壹部學術巨著。
Undoubtedly you have mistaken me for sb else.?
無疑妳是認錯人了。
肯定的: affirmative
affirmatively adv.
詞根：firm= strong 堅定
例句:She answered in the affirmative.?
她作出了肯定的答復。
The answer to the questions of this type are in the affirmative.?
對這類問題的回答是肯定的。