run, walk, read, talk
Verbs are intricately linked with time and when something happens: past, present or future. To show time, verbs can change their tense and form. So for example we can change a verb thus:
I worked all day yesterday.
I am working now.
I will work all next week.
We can also use certain verbs to tell us about how we feel about something happening. We use modal verbs like this:
You should see a doctor.
It must rain soon or the crop will die!
See the main article, Modal Verbs.