I have trouble to memorizing and understanding the tenses, can you tell me the easy way?
It's all about the simple tense When you've mastered the simple tenses, it would be easy to understand the rest of the tenses. The simple tense is not really simple as it name. Give more attention to the use of auxiliary verbs (to be, do-does-did, etc.), regular and irregular, then the tenses would be no more a big problem to understand.