If you are starting out, here are some of the most essential idioms often covered at the elementary to pre-intermediate level:
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Searching for is the first sign that you are moving from textbook English to real-world English. Idioms are not "difficult"—they are just different. With the structured, self-study approach of Cambridge’s "In Use" series, an elementary student can confidently learn 500+ idioms within two to three months. If you are starting out, here are some