pref. with; together

pref. 意为“一起”，或起强化语义的作用，有cor-，col-，con-，co-等变体。

❖ 在b, m, p等发双唇音的字母前用com-，如：combine（联合）；commercial（商业的）；common（共同的）；compare（比较）；compete（比赛）；component（部件）；

❖ 在r字母前用cor-，如：correct（正确的）；correction; correspond; corrupt（腐败）；

❖ 在l字母前用col-，如：collect（收集）；college（大学）；

❖ 在其他辅音字母前用con-，如：concert（音乐会）；conclude（断定）；conduct（引导）；conference（会议）；congratulate（祝贺）；connect（连接）；consist（由…组成）；contain（含有）；contemporary（同时代的）；convenient（方便的）；conversation（对话）。

❖ 在元音字母前及某些情况下用co-，如：coincidence（巧合）；co-worker（同事）

其他例词

com-: comfort; command; commit; communicate; communism; communist; companion; company; compass; compensate; competition; complete; complex; composition; comprehension; compressed; compromise; compulsory; comrade

con-: conceited; concentrate; concept; concern; concrete; condemn; conductor; confident; confirm; conflict; confuse; connection; conscience; consequence; conservation; conservative; consider; consideration; consistent; constant; constitution; construct; construction; consult; consultant; consume; container; content; continent; continue; contribute; contribution; convenience; conventional; convey; convince