我忘带手机了，只好回家去拿。

Wǒ wàng dài shǒujī le, zhǐhǎo huíjiā qù ná.

I forgot to bring my phone, so I have to go home to get it.

他忘记了我的名字。

Tā wàngjì le wǒde míngzi.

He forgot my name.

别忘记明天来上课。

Bié wàngjì míngtiān lái shàngkè.

Don't forget to come to class tomorrow.