The purpose of this article is to help ESL (English as a Second Language) students or English language learners (ELLs) how to express or use moods correctly when they study English. The expression of moods was summarized and illustrated from various examples cited or given, on the basis of the writer's more than twenty years' teaching experience for ESL students and extensive review of different English grammar books, reference books, magazines, newspapers, books, and English dictionaries, in order for those students to further understand how to use moods appropriately. The goal of this article is that it will serve as a guide for ESL students, English language learners, and their teachers.