Tenses in English language have two forms: simple and progressive (also called continous)

SIMPLE PROGRESSIVE

present I work. I am working.

past I worked. I was working.

present perfect I have worked. I have been working.

past perfect I had worked. I had been working.

future I will work. I will be working.

future perfect I will have worked. I will have been working.

Simple and progressive forms can also occur with

conditionals I would work. I would be working.

Modals I may work. I may be working.

Both simple and progressive forms usually give a general idea of when an action takes place. But the progressive forms also tell us that an activity is (or was or will be) in progress, or thought of as being in progress.