Le it's for masculin (man) La it's for feminin( girl) L' when the word start by a vowel Les it's for all the nouns in the plural Lui it's him Leur it's their
Le is masculine La is feminine L' is when there are 2 vowels together. (e.g. l'eau - it would be le eau but there are 2 vowels next to each other) Les is plural Lui means to him/her (e.g. lui a dit - meaning said to him/her) Leur means their