Avoiding Shifts in Verb Tense
Time keeps everything from happening at once. Some things took place in the past, some are happening now, and some will take place in the future.
When you write, verb tenses help you control time.
In the past, I learned to ride a bicycle.
Now I am learning to ride a hoverboard.
In the future, maybe I will learn to ride a unicycle.
Choose the right tense—past, present, or future—and stay in it unless you have a good reason to change. Avoid accidental tense shifts.