他从二十二岁起就是老师了。
He has been a teacher since he was twenty-two.
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has英 /hæz/|美 /hæz/
been英 /biːn/|美 /bɪn/
since英 /sɪns/|美 /sɪns/
解释
现在完成时 has been 表示身份从 22 岁持续到现在；since he was twenty-two 用过去时从句指出身份的起点年龄。
He has been a teacher since he was twenty-two.
现在完成时 has been 表示身份从 22 岁持续到现在；since he was twenty-two 用过去时从句指出身份的起点年龄。