因為這兩題都少了介系詞導致句子不完整
舉第二題為例pay attention後面要有to(所以要變成to which)
不確定的話試著倒回去念看看(介系詞有沒有少 應該很明顯)
會變成 You should pay attention to some points
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謝謝你 但我不知道什麼時候會有介系詞 是有什麼方法能判斷嗎