4 sentences

1. 我永远忘不了他的笑容。

   wǒ yǒng​yuǎn wàng​bu​liǎo tā de xiào​róng.

   I will never forget his smile.

   Source: Dong Chinese Dictionary

2. 我忘不了那一年。

   wǒ wàng​bu​liǎo nà yī nián.

   I can't forget that year.

   Source: OpenSubtitles

3. ‎有些事你永远都忘不了，对吧？

   ‎ yǒu​xiē shì nǐ yǒng​yuǎn dōu wàng​bu​liǎo, duì ba?

   Some things you never forget, huh?

   Source: OpenSubtitles

4. 我也忘不了她。

   wǒ yě wàng​bu​liǎo tā.

   I can't forget her either.

   Source: OpenSubtitles