老师看到以前很内向的学生变得自信开朗，感到无比欣慰。

Lǎoshī kàndào yǐqián hěn nèixiàng de xuéshēng biàn de zìxìn kāilǎng, gǎndào wúbǐ xīnwèi.

The teacher felt extremely gratified to see a formerly shy student become confident and outgoing.

看到你这么努力，我感到很欣慰。

Kàndào nǐ zhème nǔlì, wǒ gǎndào hěn xīnwèi.

Seeing you work so hard, I feel very gratified.

父母得知儿子考上大学，十分欣慰。

Fùmǔ dézhī érzi kǎoshàng dàxué, shífēn xīnwèi.

The parents were very gratified to learn that their son was admitted to university.