Present perfect

Present perfect

The present perfect is formed from the present tense of the verb have and the past participle of a verb...

Lesson 
http://www.englishpage.com/verbpage/presentperfect.html

Vocabulary
http://www.aprenderinglesfacil.es/2008/06/presente-perfecto-present-perfect-tense.html

Grammar
http://www.studyspanish.com/lessons/presperfect.htm

Exercise
http://www.englisch-hilfen.de/en/exercises/tenses/present_perfect_statements.htm

Video 
http://www.skypeenglishclasses.com/skype-english-blog/videos/english-present-perfect-video-with-exercise/

Present continuous and past simple

Present  continouns lesson
http://www.englishpage.com/verbpage/presentcontinuous.html

Present continuous practice

http://www.eclecticenglish.com/grammar/PresentContinuous1F.html

Present continuous excercise
http://www.perfect-english-grammar.com/present-continuous-exercise-6.html

http://www.englisch-hilfen.de/en/exercises/tenses/present_progressive_auxiliaries.htm

Videos
http://www.youtube.com/watch?v=EU_OC-j6pjY

Simple past
Lesson
http://www.ego4u.com/en/cram-up/grammar/simple-past
http://www.englishpage.com/verbpage/simplepast.html

Practicce
http://www.englishgrammarsecrets.com/pastsimple/exercise1.html

Excercise
http://www.perfect-english-grammar.com/past-simple-exercise-7.html

Videos

http://www.youtube.com/watch?v=Qp70cSK9hxo