Verbs are important in sentences as they help to establish the tense.
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If you want to see a few examples, click on the video.
Links to practise TENSES!
http://www.softschools.com/quizzes/grammar/verbs/quiz236.html
http://www.englishpage.com/verbpage/verbtenseintro.html
http://www.eslgamesworld.com/members/games/grammar/perfectpast/present%20perfect%20hangman.html
http://www.bbc.co.uk/skillswise/game/en32tens-game-tenses-treasure-hunt