Verbs are a necessary component of a full sentence. There are several types of verbs, but this post focuses on auxiliary verbs and modal verbs.
Auxiliary verbs, or helping verbs, are be, do, and have. These verbs are useful when forming other tenses. They also help form moods and voices of other verbs.
Vivian is writing a report. (present progressive)
Carlos didn't write the report. (past simple)
Jennifer has already written the report. (present perfect)
Modal verbs are must, shall, will, should, would, ought (to), can, could, may, and might. These verbs express necessity, possibility, or ability.
We must finish our project by the end of the week.
You should call your client in the morning.
Stephen can't focus on his work right now.