I can’t hardly understand what he is talking about. 我不能幾乎無法理解他在說什麼。
(正確的)
I can hardly understand what he is talking about. 我幾乎聽不懂他在說什麼。
此外,在只有一個音節的某些副詞(quick、faster、fastest)上加 -er 或 -est 來形成副詞的比較級,超過一個音節的副詞會用 more 或 most 來形成比較級。
Tess learns quickly than Tom does, but Tom gets a higher score in exams because he studies more often than Tess. Jack learns most slowly among them. Tess 學得比 Tom 快,但 Tom 的考試分數更高,因為他比 Tess 學習的更頻繁。Jack在他們中間學得最慢。