* Simple: "My friend is bilingual, speaking both English and Spanish."
* Descriptive: "The company requires all customer service representatives to be bilingual in English and Mandarin."
* Specific: "Being bilingual in French and Arabic allowed her to easily communicate with clients in both countries."
* Comparative: "While many people in the city are monolingual, a significant portion is bilingual or even multilingual."
Remember to use "bilingual" correctly. It refers to the ability to speak two languages fluently.