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Who was I used to be? 你想表达什么意思？

1. “我用来充当谁？”（别人把我当枪使）英语可以这样说：

Who was I used to be?

2. “我曾经是谁？”的英语是：

Who used I to be?
Who did I use to be?

网友认真阅读以下 used to 的用法：

情态动词used to 意为“过去常常”，表示过去特有的习惯，但现在并非如此，用来强调今昔对比。其否定形式为：usedn't to或didn't use to。其疑问形式是，将used提到主语前：Used he to...? 或用Did 开头：Did he use to...?。

She doesn't get up early as she used to. 她现在不像以前起得那么早了。

There used to be a temple here. 从前这里有一座庙。

否定句的两种形式：

I didn't use to like opera but my husband has converted me.

I usedn’t to like opera but my husband has converted me.

我过去不喜欢歌剧，但我丈夫改变了我。

疑问句的两种形式：

Did he use to go to the same school as your brother?

Used he to go to the same school as your brother?

他过去和你哥哥去同一所学校上学吗？