Choosing A or An
Use the correct form of the indefinite article — 'a' before words beginning with a consonant sound and 'an' before words beginning with a vowel sound (e.g., a rock, an open box, an hour, a unicorn)
Usually learned at ages 7–8
Builds on: Determiners and articles, Basic Nouns & Verbs (helps)
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On the map from: Marble Skill Taxonomy (v1), © Generative Spark, Inc. (withmarble.com), text CC BY-SA 4.0, database ODbL 1.0: https://github.com/withmarbleapp/os-taxonomy