As or Like?

As and like explained in Spanish

http://www.curso-ingles.com/gramatica-inglesa/like-as.php

As and like explained in Spanish with exercises:

http://www.aulafacil.com/Ingejerc/Lecciones/Lecc36.htm

As and like explained in English:

https://learnenglish.britishcouncil.org/es/grammar-reference/and

As and like, BBC explanation:

http://www.bbc.co.uk/worldservice/learningenglish/grammar/learnit/learnitv63.shtml

As and like exercise with answers:

http://www.better-english.com/grammar/aslike.htm

As and like explanation with activity:

http://www.grammar.cl/Notes/Like_vs_As.htm

So...past simple or continuous?

Past simple and continuous, explained in Spanish:

http://www.vitutor.com/gramatica_inglesa/verb_tense/past_simple_continuous.html

Past simple and continuous, explanation in Spanish and exercise:

http://www.aulafacil.com/Ingejerc/Lecciones/Lecc19.htm

Explanation in video:

http://www.blueblocnotes.com/grammar/past-tenses/past-simple-and-continuous

Past simple and continuous. Summary in Spanish:

http://www.english-area.com/paginas/pasadosimplevspasadocontinuo.pdf

Present simple or continuous?

Differences between simple and continuous present, explained in Spanish, with exercises:

http://www.vitutor.com/gramatica_inglesa/verb_tense/present_simple_continuous.html

Summary of both tenses, in Spanish:

http://www.english-area.com/paginas/psimplevspcontinuo.pdf

Explanation and exercise, in Spanish:

http://www.aulafacil.com/Ingejerc/Lecciones/Lecc17.htm

Explanation of both tenses and exercises:

http://teachermarta.blogspot.com.es/2008/04/repasa-presente-simple-y-presente.html

Quiz about both tenses:

http://esl.about.com/library/Spanish/bl_spbgpresorcont.htm

Explanation in Spanish with the possibility of listening to the examples:

http://www.ingles-practico.com/basico/tiempos-verbales/presente-simple-continuo.html

Irregular verbs

Explanation in English and exercises:

http://www.englishpage.com/irregularverbs/irregularverbs.html

(if you go to flashcards, you´ll find a good game to practice!)

List of irregular verbs with translation into Spanish:

http://www.dad.uncu.edu.ar/upload/irregular-verb-list.pdf

Irregular verbs with pronunciation and exercises:

http://www.mansioningles.com/gram53.htm

Irregular verbs, explained in several languages:

http://www.englishirregularverbs.com/English_irregular_verbs_en_Espanol.html

List of irregular verbs and exercises:

http://www.saberingles.com.ar/lists/irregular-verbs.html

Irregular verbs:

http://www.shertonenglish.com/resources/es/irregular-verbs.php

More links about wh- questions and others...

Types of questions. Examples:

http://www.sherton.com.ar/curso-ingles/preguntas/whquestions.htm

Easy explanation of wh- questions, in Spanish:

http://www.gcfaprendelibre.org/ingles/curso/ingles_avanzado/wh_questions/2.do

Wh- questions explanation:

http://menuaingles.blogspot.com.es/2007/02/wh-questions.html

Examples of wh- questions and answers:

http://www.slideshare.net/adrianacera/wh-questions