随声

tā kāi shǐ gēn wǒ tán lùn tā nà jiǎ xiǎng de péng you shí wǒ jiù suí shēng fù hè

他开始跟我谈论他那假想的朋友时，我就随声附和。

When he starts talking to me about his imaginary friend, I just play along with him.