I'll think it over.
    我要仔細考慮一下。
    對話：
    A: Kate, do you want to go with me to New York?
    B: I can't promise you. I'll think it over.
    A: All right. It's up to you to make your own decision.
    　　　 　　　　　　　　 　　　　　　　　 　　
    A：凱特，你想和我一起去紐約嗎？
    B：我不能向你保證。我得仔細考慮一下。
    A：好吧，由你自己決定。