1. general introduction to types and forms

source: EducatorVids3  2012-06-11 

Types of verb
source: Holmwood's Online Learning  2013-02-26
exercises: https://www.holmwoods.eu

What are the Verb Forms and Differences?
source: TeacherPhilEnglish  2012-12-26

Verb Forms and Verb Tenses
source: Mario González  2008-10-07   

Types of Verbs
source: Iken Edu   2012-03-28
http://www.mexuseducation.com,

Three Kinds of Verbs: auxiliary or helping verbs / modal verbs / main verbs
source: Smrt English  2013-01-02

what is a verb: linking verbs, action verbs, and helping verbs 
source: LearnAmericanEnglishOnline   2014-9-6

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