He hasn't been a teacher for 10 years old.
他不当老师已经有10个年头了.
He 单数第三人称,因此have必须变为has,否定在其后加not即可.
楼下的答案一般现在时和现在完成时居然同时出现在一个句子里,真是白学英语啦!
teacher,he,be,have,a,10years old,for,连词成句后变否定是：_____________
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