Take some time to learn English and improve grammar, vocabulary and reading skills. You can practice here, www.englishpractice.com Test your knowledge of English verb tenses with the following exercises, http://www.englishtenses.com/present_simple_exercises if you want to revise the present simple tense.
In case you would like to try the Past Simple, try some of the exercises in the following link, http://www.englishtenses.com/tenses/past_simple (Have a look at the theorical tips, how to use the past simple properly and then, you can practice here, http://www.englishtenses.com/exercise/past_simple_exercise1)
For the Present Perfect Simple Tense, click on the following and do the exercises to employ the past participle appropriately. http://www.englishtenses.com/perfect_tenses.html
This is an effective way to improve your English! Go on, then! Enjoy yourself!