Vocabulary is the set of words you know and use. For speaking, the most useful vocabulary is high-frequency words and phrases you can use in many situations. Learning words in full sentences and in conversation helps you remember and use them.
Focus on words you'll actually say: daily routines, work, hobbies, feelings. Learning words in phrases (e.g. 'make a decision', 'take a break') is more useful than single words. Rozy lets you use new vocabulary in real dialogue and get feedback.
The more words you can recall quickly, the easier it is to keep speaking. Practising in conversation—with an AI or a partner—forces you to retrieve words under pressure, which strengthens memory.
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