a) affirmative, negative, questioning and answering forms

Simple Present Tense
source: TeacherPhilEnglish    2013-01-14

Present Simple
source: Cambridge University Press ELT    2013-01-03

The Simple Present Tense
Gerry English Expressions         2015年12月27日

The present simple tense
source: portalfitness   2011-07-27

Present Simple tense
source: English Lessons with Alex       2011年5月15日 
quiz at http://www.engvid.com/present-simple-...

Present Simple - YES/NO QUESTIONS
source: AlexESLvid    2011-07-20
quiz: http://www.engvid.com/present-simple-....

Present Simple - WH- QUESTIONS
source: AlexESLvid    2011-08-01
Test: http://www.engvid.com/present-simple-....

What is Present Tense?
source: Twominute English   2014-6-12
for more lessons, articles and exercises: http://twominenglish.com

Using The Simple Past Tense
source: Twominute English   2013-6-06
exercises: http://twominenglish.com/video/100-Us...

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