使乜

In Cantonese, the verb 使 (sai2) means "to need" or "to use." While usually seen in the negative form 唔使 (m4 sai2), in this pattern it combines with the question word 乜 (mat1) ("what") to literally ask "What need [is there]?"

Key characteristics include:

• The Variant 使咩: In daily speech, you will frequently hear 使咩 (sai2 me1). Linguistically, 咩 (me1) is a contraction of 乜嘢 (mat1 je5), making 使咩 the contracted form of 使乜嘢 rather than 使乜, but it functions identically and is perhaps even more common.
• Rhetorical Nature: When followed by a verb or adjective, it functions as a rhetorical question asserting that the action or state is pointless or unnecessary. When followed by a noun, it is overwhelmingly rhetorical (e.g., 使乜架生 sai2 mat1 gaa3 saang1? means "Why use tools? / There's no need for tools!"). Note that for the literal meaning of "to use," modern Cantonese overwhelmingly prefers 用 (jung6) (e.g., 你用乜嘢架生？ nei5 jung6 mat1 je5 gaa3 saang1? "What tools are you using?"), and using 使 (sai2) literally in a question is rare and unnatural today. Important note for learners: When used rhetorically as a statement of reassurance or dismissal, you should not actually answer the question.
• Fixed Phrase 使乜講: The single most common verb pairing you will hear is 使乜講 (sai2 mat1 gong2), which functions as a fixed phrase meaning "Needless to say" or "It goes without saying."
• 使乜 + 咁 + Adjective: A very common structural pairing is using 使乜 with 咁 (gam3) and an adjective to mean "Why be so [adjective]?" (e.g., 使乜咁客氣呀 sai2 mat1 gam3 haak3 hei3 aa3 - "Why be so polite?").
• Pronoun Placement: The subject usually comes before 使乜 (e.g., 你使乜驚 nei5 sai2 mat1 geng1 - "Why are you scared?").
• Nuance: Depending on context, it can be used for reassurance (e.g., "Why be scared?"), dismissal (e.g., "Why listen to him?"), or politeness (e.g., "Why be so formal?").
• Sentence Particles: It is almost always paired with sentence-final particles like 啫 (ze1) or 呀 (aa3) to soften the tone, or 喎 (wo3) to express friendly reassurance or mild disagreement.
• Slang and Standalone Usage: You can use it on its own as an exclamation, like 使乜呀！ (sai2 mat1 aa3!) ("There's no need for that!"). You might also hear slang variants: 使鬼 (sai2 gwai2) is a mild, everyday slang. Be warned that 使撚 (sai2 lan2) is a highly profane and vulgar variant that functions identically but should be avoided in polite company.
• Written Variants: In informal digital contexts like WhatsApp or social media, you will often see the character 使 (sai2) replaced by exact homophones like 駛 or 洗 (all pronounced sai2). You must learn to recognize the extremely common written variants 洗乜 / 洗咩 and 駛乜 / 駛咩.
• Register: This is a colloquial expression. In formal Standard Written Chinese, the rhetorical equivalents include 何必 (ho4 bit1), 哪用 (naa5 jung6), and 哪裡需要 (naa5 leoi5 seoi1 jiu3).