Chinese grammar › HSK 5
In case ... with 万一 — Chinese grammar (HSK 5)
万一 + Unwanted possibility，(就) + ...
万一 (wànyī) means "in case / if by any chance" and introduces an unlikely but unwelcome possibility. It is like 如果, but only for things you hope will not happen. It often appears in advice about being prepared.
Examples
| 带上伞吧，万一下雨呢？ Dài shang sǎn ba, wànyī xià yǔ ne? | Take an umbrella, what if it rains? | |
| 万一你迷路了，就给我打电话。 Wànyī nǐ mílù le, jiù gěi wǒ dǎ diànhuà. | If by any chance you get lost, call me. | |
| 把密码写下来，万一忘记了还能找到。 Bǎ mìmǎ xiě xiàlái, wànyī wàngjì le hái néng zhǎo dào. | Write the password down, in case you forget it. |