1. 他又一次违背了诺言。

[ tā yòu yī cì wéi bēi le nuò yán 。 ]

He broke his words once again.

2. 如果汤姆不能信守诺言，他就会丢面子。

[ rú guǒ tāng mǔ bù néng xìn shǒu nuò yán ， tā jiù huì diū miàn zǐ 。 ]

If Tom cannot keep his promise, he'll lose face.