All four words are pronounced identically in front of consonants: the s in the plural forms is silent. In front of a vowel or mute h, a liaisonis required. See more

You can ask questions with either est-ce que or inversion. Par exemple… Informally, you can put queland the noun at the end of the question: Par exemple… When asking a question … See more

Quel is used for asking about a choice between two or more options. In contrast, when asking what something is – a definition or description – you need an interrogativ… See more

Despite the name, the interrogative adjective quelis not limited to questions. Par exemple… To say "which one?" you need the interrogative pronoun lequel. See more