Tā / bù / dàn / rèn / zhēn / dú / shū / hái / nǔ / lì / dǔ / xíng / bǎ / chéng / nuò / fù / zhū / xíng / dòng

他不但认真读书，还努力笃行，把承诺付诸行动。

He not only studies hard but also follows through, putting his promises into action.