We can change the form of a verb. (These changes in form are used in conjugations. We will talk about conjugations in later lessons.) For example, a verb can have an s added to it as in eat, eats or run, runs. Other changes could be eating, ate, or eaten for the verb eat. Run could be changed to running, or ran. Irregular verbs which we will cover later have several confusing changes.
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from Daily Grammar Lessons Blog http://dailygrammarlessons.blogspot.com/2018/09/lesson-13-parts-of-speech-verbs.html