I'm thin now .I was not thin three years ago.合并成一句话

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I'm thin now but I was not thin three years ago

请你采纳，I am thinner than three years ago. 我比三年前瘦。

合成一句, 要注要小学基本文法就夠了 !

I'm thin now but wasn't thin 3 years ago.

but 是连接词, 主语 I  不必再重复了, 小学生都明白, 包括我在内.

我现在很瘦，但是我三年前不瘦！

I'm thin now, but I was not thin three years ago,