pinyin: zhēng & zhèng

Chinese phrase: 正月 zhēng yuè - the first month of the lunar year
正确 zhèng què - right, correct

Examples:
征
pinyin: zhēng
Chinese phrase: 征求 zhēng qiú - solicit, ask for
征税 zhēng shuì - levy taxes

整
pinyin: zhěng
Chinese phrase: 整齐 zhěng qí - in good order, tidy
完整 wán zhěng - whole, complete

证
pinyin: zhèng
Chinese phrase: 证明 zhèng míng - prove, demonstrate
证据 zhèng jù - evidence