Yesterday they were teachers.
要看上下文语境，LZ想表达的意思是不是 昨天他们还是老师，今天就不是了？
如有这层意思在里面 还可以加一个still 更为妥帖： Yesterday they were still teachers.
Yesterday they were teachers.
如果答案不符合，楼主能不能把想表达的意思发上来？就如同楼上所说的那样，是想强调今天他们就不是老师了，还是另外的意思呢？不同的意思会有不同的说法。
They were teachers yesterday.
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