如果下雨，晚会就在教室里开。

Rúguǒ xiàyǔ, wǎnhuì jiù zài jiàoshì lǐ kāi.

If it rains, the party will be held in the classroom.

晚会八点开始，你别迟到。

Wǎnhuì bā diǎn kāishǐ, nǐ bié chídào.

The party starts at eight, so don't be late.

昨晚的晚会人很多，气氛很好。

Zuówǎn de wǎnhuì rén hěn duō, qìfēn hěn hǎo.

There were many people at last night's party, and the atmosphere was great.