When we want to talk about what the subject of a sentence does, we use a verb. Verbs tell us about an action; they are sometimes called doing words. Here are some simple verbs:
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.
See the main articles, Verb Tenses and Verb Forms.
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.