inflect
/ɪnˈflekt; ɪn`flɛkt/ v[Tn]
1 (grammar) change the ending or form of (a word) to show its grammatical function in a sentence 使词尾屈折, 使词尾变化（以示其在句中之语法功能）
Most English verbs are inflected with `-ed' in the past tense. 英语大多数动词过去式词尾均变化为-ed的形式.
2 make (the voice) higher or lower in speaking 使（说话的声音）变高或变低
By inflecting the voice more one can hold the attention of an audience. 讲话声音有些抑扬变化可以吸引住听众的注意力.