如题所述
become的三种时态为:became,becoming,has/have became。
其中,become用于一般现在时,became用于一般过去式,has/have became用于现在完成时。
become 在作及物动词时意为“适合;相称”,作系动词时意为“成为;变得;变成”。
常用短语:
become extinct 灭绝 ; 变坏 ; 绝种
become invalid 作废 ; 成为无效 ; 变得无效 ; 这药已失效了
become convinced 确信