tā / nián / qīng / shí / shì / ge / lèng / tóu / qīng / zuò / shì / cóng / lái / bù / kǎo / lǜ / hòu / guǒ

他年轻时是个愣头青，做事从来不考虑后果。

When he was young, he was reckless and never considered the consequences.