you should practice everyday ,Arabic grammar is very difficult but everything becomes easier by practice. i know this is not much help but believe me this is the most effective way. i wish you the best.

@Cherry & Jura شاديis talking about Arabic verbs not English verbs,

In order to improve your memory and memorize tenses, you can follow 2 methods. First is the repetition-based method, where you learn words by writing them several times or saying them repeatedly until you remember them all. If you patiently follow the process, you will see your vocabulary extended very well. Secondly, you also need have to have a notebook with your own note-taking rules. Each time you log onto Italki, note down any new words in this Answers section. The only problem is whether you want a rich vocabulary or not. Any good plan should answer the four following questions. Firstly, how many words will you learn a week: five, ten, fifteen or more? Secondly, when will you learn them? At a fixed time every other morning or anytime you feel like learning?This is what I personally recommend . Thirdly, how often will you review what you have learnt: once a week, once a month or before a test ? Finally, what areas will you focus on: sports, music, games or sciences? The answers may vary a great deal from one person to another depending on memory, schedules and interest. Otherwise, your study results won't be as you expected. You can gain a big vocabulary and improve your tenses by simply by determining what field of words to learn, making a plan of learning, choosing a learning method and regularly practising your plan and method. Although it is up to you, daily vocab and tenses learning is better than weekly and weekly is better than monthly.Good luck.

Hello， English is one of the easiest language to memorize its tenses apart from Chinese as far as I know ,where there are almost no tenses. - You have only to learn basically 2 forms of conjunction of any verb: The simple past tense The past Participle - You have to recognize the specific ending *s* ,that is attached to verbs in their present tense in case of using the 3rd singular personal pronouns (he/she/it) . - Most of the English verbs are regular verbs and their conjunction is standard: Add "ed" at the end of the infinitive base of the verb in both simple past and past participle tenses. Example: play playED playED -Most English verbs are regular except for a list of irregular verbs that have to learned by heart repeating it again and again ,trying to apply the verbs in the list by making sentences and constantly reading them in texts Check the list here: http://www2.gsu.edu/~wwwesl/egw/verbs.htm - Beside this list you have to learn the conjunction of the 2 basic verbs by heart : Verb "to be" and verb " to have". They are very essential for forming the participle ,the passive voice and the continuous tense that ends in "ing". - The best way after having learned the basic is to read a lot,do some grammatical tense exercises and use the verbs in forming sentences. Good luck:)

Thank you Ahmed for the alert, however it was not so clear in the question that she meant the arabic tenses :)