If I can't change your mind

若我不能转变你的心意

Change one’s mind改变主意

例句：

Change mind and change it again, because nothing is permanent.

不断改变想法,因为没有什么是永恒不变的.

People change their mind for a variety of reasons.

人们会由于种种原因改变主意。

He had an unaccountable change of mind.

他莫名其妙地改变了主意。

Just let me down easy

就请你婉言谢绝我

Let down放低； 放下； 使失望； 失信

例句：

Sadly, the film is let down by an excessively simple plot.

遗憾的是，过于简单的情节使得这部电影差强人意。

He let down the tailgate so the dog could jump out.

他放下后背门，好让狗跳出来。

But then to be let down like that, oh it's so unfair!

但是接下来竟让人如此失望，唉，这真不公平！