Verb group 1Actions, events and states
Action verbs show what somebody or something does: study, write, improve. Event verbs describe something that happens: begin, change, fall. State verbs describe situations, thoughts, possession or feelings: be, know, need, believe, own. A verb does not need to describe a visible movement.
Verb group 2Main verbs and helping verbs
The main verb carries the central meaning. A helping verb supports it to form a tense, question, negative, passive or other meaning. Compare She studies, She is studying, She has studied and She might study. The complete combination is called a verb phrase.
Verb group 3Be, have, do and modal verbs
Be, have and do can be main verbs or helping verbs. In They have two lessons, have is the main verb. In They have finished, it helps finished. Modal verbs—including can, could, may, might, must, should, will and would—are followed by the base form: can improve, not can improves.
Verb group 4Subject–verb agreement
The verb must agree with its subject. Compare I study, she studies, the student works and the students work. Words such as everyone, each and neither are grammatically singular. This lesson introduces agreement; the next planned lesson will teach it in detail.
Find what happensAsk what the subject does, what happens to it or what situation it is in.
Keep the phrase togetherIn may have been affected, all four words belong to the verb phrase.
Check the contextThe same word can change jobs: record your score uses a verb; keep a record uses a noun.