Oh my goodness! I forgot!

天哪！我忘了！

God, I forgot my keys.

老天，我忘记带钥匙了。

I forgot my keys again.

我又忘记带钥匙了。

I forgot my keys, damn.

我忘记带钥匙了，真该死。

Fuck, I forgot my keys.

法克，我忘记带钥匙了。

I forgot his full name.

我忘记了他的姓名。

I forgot his name again.

我又忘记了他的名字。

I forgot my room number.

我忘记了我的房间号。

I forgot to bring my key.

我忘记带钥匙了。

I forgot to pay, so I was fined.

我忘记了缴费，所以被罚款了。