I was thin when I was a child.这句过去式有错吗?
问题描述：
I was thin when I was a child.这句过去式有错吗?
答
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,