4 无法决定
3句英文任你选
Please let me think it over.
请容我在仔细考虑一下。
I don't have the authority to decide on this alone.
我无权单独做出决定。
Would it be all right to give you an answer tomorrow?
明天再答复您好吗?

半个句型要记牢
think over (仔细考虑)

Tip:
think一词用法很多，常与介词of、about、out构成短语。 think about 和 think of这两个短语表示"考虑"、"对……有某种看法"时，可以互换。 think of表示打算、想出、关心等意义，一般不与think about互换。think about 表示经常思考、研究的意思，一般不和think of换用。 think over意为"仔细考虑相当于think about it carefully。