If you ask me, she has spoilt her children far too much.

All three expressions are a way of giving your opinion when you know that people may not like what you have to say

To tell you the truth, your father was right when he said that you undersold the company.

To be honest, I preferred it when you were blonde.

To be frank, I thought her acting was simply terrible.

8. To be honest (9) To tell you the truth (10) To be frank
知道别人可能不喜欢你要说的话时，可以用这三种表达来给出你的意见。

老实告诉你，你父亲对你低价抛售公司的判断是对的。

老实说，我更喜欢你金发的样子。

坦白地说，我觉得他的表演很糟糕。