i became teacher when i was 23.这句话中哪个单词是表语?

teacher是表语。表语用来说明主语的身份、性质、品性、特征和状态的,表语常由名词、形容词、副词、介词短语、动词的-ing、从句来充当,它常位于系动词（be,become,appear,seem,look,sound,feel,get,smell等词）之后。…………………………………………………………………………………………………… 再问： 从句中的23是was的表语吗? 再答： 恩