4 sentences

1. 你有时间去淡忘。

   nǐ yǒu shí​jiān qù dàn​wàng.

   You have time to forget.

   Source: OpenSubtitles

2. 随着时间的流逝，他渐渐淡忘了往事。

   suí​zhe shí​jiān de liú​shì, tā jiàn​jiàn dàn​wàng le wǎng​shì.

   As time passed, he gradually forgot the past.

   Source: Dong Chinese Dictionary

3. 随着时间的推移，他逐渐淡忘了那段往事。

   suí​zhe shí​jiān de tuī​yí, tā zhú​jiàn dàn​wàng le nà duàn wǎng​shì.

   As time passed, he gradually forgot the past.

   Source: Dong Chinese Dictionary

4. 老同学的名字由于太久没见已经渐渐淡忘了。

   lǎo tóng​xué de míng​zi yóu​yú tài jiǔ méi jiàn yǐ​jīng jiàn​jiàn dàn​wàng le.

   I have gradually forgotten my old classmate's name because it has been so long since we last met.

   Source: Dong Chinese Dictionary