● 保留意见

让我想想。
Let me think about it.

请给我点儿时间考虑。
I need some time to think it over.

我会考虑的。
I'll consider it. *正式的说法。表达不能马上回答时，有“请给我时间考虑”、“让我考虑考虑”的语感。

我考虑考虑吧。
I'll think about it. *比I'll consider it.的说法更随便，比直接拒绝语气要缓和。

我得琢磨琢磨。
I'll think it over.

请给我一个晚上的时间考虑。
Let me sleep on it.

我得研究研究。
I'll see what I can do.