要是

• Pinyin: yào shi
• Hanzi breakdown: 要 = 西 (west) + 女 (woman); 是 = 日 (sun) + 正 (correct, phonetic)

Meaning

If; in case; supposing that. A colloquial conditional conjunction.

A casual and spoken alternative to 如果 for expressing hypothetical or conditional situations. It is slightly more informal than 如果 and is very common in daily conversation. Often paired with 就 in the result clause. Can be used interchangeably with 如果 in most spoken contexts.

Examples

1. 要是明天下雨，我们就不去了。 If it rains tomorrow, we won't go.
2. 要是你有时间，可以来我家玩。 If you have time, you can come to my place to hang out.
3. 要是早点出发，就不会迟到了。 If we had left earlier, we wouldn't have been late.

Usage Guide

Context: everyday, conversation

Tone: casual

Do Say

• 要是你不想去，就别去了。(If you don't want to go, then don't go.)
• 要是我有钱，我就去旅游。(If I had money, I would go travelling.)

Don't Say

• 要是根据合同规定...(Don't use 要是 in formal or written contexts — use 如果 or 若 instead. 要是 is too casual for contracts or official documents.)

Origin & History

要 (want/will/if) + 是 (to be). The combination functions as a conditional marker, evolving from the hypothetical sense of 要.

Cultural Context

Generation: All ages

Social background: Universal