The indefinite article - a, an
www.englisch-hilfen.de › en › grammar1. The indefinite article – a The indefinite article a is the same for all genders. a boy a girl a cat The indefinite article has no plural form. a boy → boys We use an if the following word starts with a spoken vowel. 2. Use of the indefinite article a/an 2.1. before phrases of time and measurements (per week/weekly)