Wèi / le / shuō / fú / tā / gǎi / biàn / zhǔ / yì / wǒ / yǐ / jīng / mó / pò / zuǐ / pí / le为了说服他改变主意,我已经磨破嘴皮了。I have talked myself hoarse trying to persuade him to change his mind.