By this time you must have learnt lots of tenses and you need some help to understand all the possible tenses and how to use them. Here is a document that might help:
Verb Tense Chart
Now practice how to write sentences in some of the possible verb tenses:
Tense Form Consolidation
It’s time to practice. In the next document you will have to decide which tense to use.
Tense Consolidation Exercises