Practice -아요/어요irregularity conjugationthe polite 【Practice⑬】Let’s practice using ‘-아요/어요’ in the irregularity conjugation. Beginner -아요/어요irregularity conjugationthe polite 【-아요/어요/여요②】How to use “irregularity conjugation” that do not change according to the rules. Practice -았/었、the pastirregularity conjugation 【Practice⑪】Let’s practice using ‘-았/었/였’ to make the past tense. Beginner -았/었、the pastirregularity conjugation 【-았/었/였】How to make and express the past tense.