When you write, it is important to be aware of which tense you are using, so that you don’t mix them up incorrectly and confuse the reader. The form of the verb shows what tense you are using.

The past simple tense tells us whether something already happened. For example:

Yesterday, I walked to school, so I was late. My teacher was angry and she gave me punishment. She told me to clean the school grounds at break time. I did not enjoy that.

The present simple tense tells us whether something usually happens, or is happening right now. For example:

Usually, I ride my bicycle to school so that I arrive there early. Usually, when I walk to school, I am late. I generally prefer to ride my bike, but it is broken at the moment.

The future simple tense tells us whether something is still going to happen. For example:

After school, I will fix my bike, and tomorrow I shall decide whether to ride or to walk. I will probably ride because I will get to school early and my teacher will not punish me again for being late.