Accidentally overhearing someone say something nice about you .

无意中听到有人说你的好话。

I couldn 't help overhearing what you said .

我不免听到了你说的话。

I couldn 't help overhearing what they said .

他们讲的话我想不听到也不行。

Sorry , I couldn 't help overhearing - did you mention something .

对不起,我无意中听见你们的谈话,你是不是提到。

I couldn 't help overhearing what he said .

我禁不住偷听了他说的话。