To master English phrases in high school, you must practice regularly and immerse yourself in the language. Firstly, focus on common idioms and collocations that appear frequently in everyday conversations and academic texts. Use flashcards or a digital app to help you memorize these phrases.
Secondly, apply these phrases in real-life situations. Engage with native speakers or join an English conversation club to practice using them correctly. Additionally, watch English movies and TV shows without subtitles to improve your listening comprehension and pick up new phrases naturally.