前綴pro-來自拉丁介副詞pro，基本義為forward，forth (向前）或out (出）。作為原生詞綴pro-只與拉丁詞根相結(jié)合， 其讀音為/pre-/或/pro-/。pro-后來也被英語同化為派生詞綴，能與名詞相結(jié)合，表示 in favour of (親，贊成）或in place of (代， 副）的意思，對名詞起修飾作用，這時pro-讀音為/praii-/。

先來分析原生詞綴pro-與詞根結(jié)合的幾個詞例。

proceed [ pro- = forward 向前;ceed = to go or move 運動→] v. move forward; go on after a stop 進行；繼續(xù)進行 / Please proceed with your story.請把故事接著說下去。

proceeding n. 進程；進行；程序

proclaim [pro- = forth or out 出；claim = to shout 喊=>“to shout out 大聲說出 ”→] v. make known publicly or officially 宣告；公布 / A new law was proclaimed yesterday. 昨天頒布了一項新法令。

proclamation n. 宣布，公布；聲明 

proclamatory a. 公告的；宣言的

produce [ pro- = forth 前；due = to lead or bring 引帶；-e=>“to bring forth 引起，使產(chǎn)生”→] v. bring into existence by labour; create 生產(chǎn)；制造 / The factory produces cars. 該廠生產(chǎn)小汽車。

product n. 產(chǎn)品；產(chǎn)量；成果 

production n .生產(chǎn)；制作 

productive a. 生產(chǎn)的；生產(chǎn)性的