tā / fā / xiàn / péng / you / sòng / lái / de / lǜ / mào / zi / hòu / gān / gà / de / bù / zhī / dào / shuō / shén / me

他发现朋友送来的绿帽子后，尴尬得不知道说什么。

After discovering the green hat his friend had given him, he was so embarrassed that he did not know what to say.