突然下雨了，我们只好回家。

Tūrán xiàyǔ le, wǒmen zhǐhǎo huíjiā.

It suddenly started to rain, so we had no choice but to go home.

他突然站起来，说有一个好主意。

Tā tūrán zhàn qǐlái, shuō yǒu yí gè hǎo zhǔyi.

He suddenly stood up and said he had a good idea.

这个问题太突然了，我一时间不知道怎么回答。

Zhè gè wèntí tài tūrán le, wǒ yì shíjiān bù zhīdào zěnme huídá.

This question was too sudden, and for a moment I didn’t know how to answer.