答案是：
✘ I like dogs, she likes cats.
✓ I like dogs, and she likes cats.

I like dogs, she likes cats. 這種錯誤是一種叫run-on sentence的英文文法錯誤。

兩句完整的英文句子，例如I like dogs ; she likes cats，是不能直接放在一起，或者以comma(,)連接。中間必須加上連接詞或者用 full stop(.)或者semicolon(;)連接。例如：
1. I like dogs. She likes cats.
2. I like dogs; she likes cats.
3. I like dogs, and she likes cats.
4. I like dogs, but she likes cats.

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