[文法]tag question

[purfish (最後的單人舞)]

He decides not to come with me.
請問這句的附加問句要怎麼寫才對呢?

另外還有一句:
I don't think he is such a good guy.
這句話的附加問句是要根據前面還是後面呢?

thanks a lot ^^

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