突然開始下雨。

All of a sudden, it began raining.

Source: Tatoeba

Sentence Composition

1 突然 tūrán sudden; abrupt; unexpected
2 開始 kāishǐ
  1. to begin
  2. beginning
  3. to start
  4. initial

classifier: 個
3 下雨 xiàyǔ to rain