1. 他突然在晚会上出现了。

[ tā tū rán zài wǎn huì shàng chū xiàn le 。 ]

He suddenly appeared in the party.

2. 这只是为了庆祝我的生日而举行的晚会。

[ zhè zhǐ shì wèi le qìng zhù wǒ de shēng rì ér jǔ xíng de wǎn huì 。 ]

It's only a party in honor of my birthday.