以...為...

The structure follows: (Subject) + 以 (ji5) + [Noun/Pronoun A] + 為 (wai4) + [Noun/Adjective B]. Note that the Subject is frequently omitted, especially in policy statements, slogans, or general observations. When a subject is present, it is often an inanimate topic (such as a restaurant, project, or policy) rather than a person, reflecting Cantonese topic-comment flexibility.

Key characteristics include:

• Literal Meaning: The character 以 (ji5) literally means 'to take' or 'to use', while 為 (wai4) means 'to act as' or 'to become'. Together, they mean 'to take A as B'.
• Register: Productively building new sentences with this frame is generally for High Register Cantonese. You will hear it in news broadcasts, read it in formal documents, or use it in business presentations. However, lexicalized idioms using this frame are universal and frequently used in everyday speech.
• Vocabulary Register Constraint: Because this pattern belongs to a formal register (書面語), the vocabulary placed into the [A] and [B] slots should generally match this elevated tone. Plugging in highly colloquial words (like 好嘢 - hou2 je5) sounds unnatural and jarring.
• Tone: The character 為 must be pronounced in the 4th tone (wai4). Using the 6th tone (wai6) is a common error as that tone means 'for/because of.'
• Functional Role: Unlike the simple copula 係 (hai6), this pattern implies a deliberate choice or a functional assignment. For example, 'taking safety as the priority' (以安全為先 - ji5 on1 cyun4 wai4 sin1) implies a policy decision, not just a state of being.
• The 'ji5 wai4' Trap: Do not confuse this pattern with the single verb 以為 (ji5 wai4). While they share the same characters, the verb 以為 usually implies 'to mistakenly think' or 'to wrongly assume' in everyday Cantonese (though in formal contexts it can simply mean 'to believe or consider'). In the 'Take as' pattern, the two characters are separated by the object being defined.
• Common Collocations: The most frequent productive use of this frame is 以 [X] 為主 (ji5 [X] wai4 zyu2), meaning 'taking [X] as the main focus' or 'primarily [X]'. For example, 呢間餐廳以海鮮為主 (ni1 gaan1 caan1 teng1 ji5 hoi2 sin1 wai4 zyu2 - This restaurant focuses primarily on seafood). Other highly common collocations include 以...為例 (ji5... wai4 lai6), meaning 'to take [X] as an example', 以...為榮 (ji5... wai4 wing4), meaning 'to take pride in...', 以...為準 (ji5... wai4 zeon2), meaning 'to take as the standard' or 'shall prevail' (e.g., 圖片只供參考，以實物為準 - tou4 pin3 zi2 gung1 caam1 haau2, ji5 sat6 mat6 wai4 zeon2 - pictures are for reference only, the actual product shall prevail), and 以...為基礎 (ji5... wai4 gei1 co2), meaning 'based on' or 'taking as the foundation'.
• Single-Character [B] Slot: Notice that in the most common collocations, the [B] slot is almost always a single-character classical Chinese morpheme. This gives the pattern its characteristic rhythm. Common examples include 主 (zyu2), 先 (sin1), 例 (lai6), 榮 (wing4), 準 (zeon2), 重 (zung6), and 傲 (ngou6).
• Negation: To negate this pattern, use the formal 不 (bat1) directly before 以 in highly formal contexts (不以...為...). In spoken Cantonese, use 唔係 (m4 hai6) before 以 for descriptive states or facts (e.g., 呢間餐廳唔係以海鮮為主 - ni1 gaan1 caan1 teng1 m4 hai6 ji5 hoi2 sin1 wai4 zyu2), or use 唔會 (m4 wui5) for volitional negation (唔會以...為...).
• Lexicalized Phrases: Many common four-character idioms use this frame, such as 以人為本 (ji5 jan4 wai4 bun2 - people-oriented) and 以和為貴 (ji5 wo4 wai4 gwai3 - harmony is prized). You will also frequently encounter fixed negated idioms like 不以為然 (bat1 ji5 wai4 jin4 - to disagree / not take it to be right) and 不以為意 (bat1 ji5 wai4 ji3 - to not care / pay no attention), which are common ways learners see the negated form in the wild.