These skills develop by seeing and hearing the language in real contexts; idioms and phrases are learned not by memorization but in the situations they're used in. The formal/informal difference is about giving the teen awareness of "when, with whom, and how to speak." Authentic content (series, social media, articles) shows these differences naturally.
Detailed Explanation
Idioms, everyday phrases, and the formal/informal difference are the fine details that move a teen's English from "correct" to "natural." These skills rest on a basic truth: this layer of language is learned not through rules but by seeing and hearing real use.
Idioms and phrases: learned in context
Idioms ("break the ice," "piece of cake") and everyday phrases can't be deduced from the individual meanings of the words; so they require context, not memorization. As the teen sees these expressions in real content (series, social media, conversations), they naturally learn both their meanings and when they're used. What matters is not memorizing these expressions from a list but recognizing them along with the situations they live in.
Formal/informal language: "register" awareness
In language, "register" expresses the level of formality of a conversation: talking with a friend and writing an email to a teacher require different language. This is also closely related to the distinction between everyday and academic/formal language (Cummins' BICS/CALP distinction). Giving the teen awareness of "when, with whom, and how to speak" — for example showing the difference between "Hey, what's up?" and "Good morning, I hope this message finds you well" — helps them use the language appropriately for the situation.
To develop these skills
- Show idioms and phrases in authentic content (series, video, articles), not on a list.
- Teach each expression with the situation it's used in; context is the key.
- Show formal and informal examples side by side to sense the difference.
- Build register awareness by asking the teen "who and where would you say this to?"
- Have them use newly learned expressions in the right context; use consolidates.
Points to keep in mind
Memorizing idioms in long lists usually isn't durable and can lead the teen to use them in the wrong context. Likewise, using informal/slang expressions in a formal setting (such as an exam essay) can be inappropriate; so register awareness matters. The real goal is for the teen to use the right expression in the right situation; that comes through context and awareness.
Expert Note — Andrea Massari Rosario
When teaching idioms, I don't give a memorization list; I show the moment one appears in a series or song. When a teen sees "break the ice" in a scene, they never forget it. And I always explain the formal-informal difference like this: language is like a wardrobe; you wear both sneakers and a suit in the right place. What matters is sensing which situation requires which language.
Related Terms
- Idiom: A fixed expression whose meaning can't be deduced from the individual words.
- Register: The level of formality of a conversation; language varying by situation and addressee.
- Everyday vs academic language: The distinction between informal conversational language and formal/academic language (BICS/CALP).