Xiao Ming was a student, but he isn't now.
was: 过去式，表示以前，就不用再加 before.
XiaoMing was a student, but he is not now
Xiao Ming was a student before,but now,he isn't a student anymore.
Xiao Ming was a student before, but not now. be动词是was 不是is 因为是过去式
Xiao Ming was a student in the past, but now he isn't.
Xiao Ming is a student before, but not now.
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