I was thin when I was a child.这句过去式有错吗?

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I was thin when I was a child.这句过去式有错吗?

I was thin when I was a child.这句过去式有错吗?
I was thin when I was a child.这句过去式有错吗?

I was thin when I was a child.这句过去式有错吗?
become因为后面的时间标志是when I was a child.是过去时的标志.你第二句没有错 用过去式哦~became become 说明这个动词的意思是变成~;成为,