搞错

wǒ bǎ tā liǎ gǎo cuò le

我把他俩搞错了。

I mistook the one for the other.

zhè fēng xìn shì gěi bié rén de yī dìng gǎo cuò le

这封信是给别人的，一定搞错了。

This letter is addressed to someone else. There must be some mistake.

wǒ gǎo cuò le

我搞错了。

I made a mistake.