我wǒ忘wàng记jì了liǎo他tā的de名míng字zì。

I forgot his name.

别bié忘wàng记jì带dài钥yào匙shi。

Don't forget to bring the keys.

她tā忘wàng记jì了liǎo我wǒ们men的de约yuē定dìng。

She forgot our appointment.

我wǒ忘wàng记jì关guān门mén了liǎo。

I forgot to close the door.

别bié忘wàng记jì给gěi妈mā妈ma打dǎ电diàn话huà。

Do not forget to ring your mum.