1) PRESENTE
https://conjuguemos.com/verb/130#
https://conjuguemos.com/verb/135

2) PASADO (Pretérito/Imperfecto)
https://www.spanishdict.com/guide/preterite-vs-imperfect-in-spanish
https://conjuguemos.com/verb/136
https://conjuguemos.com/verb/119

3) SUBJUNTIVO (Presente)
https://www.spanishdict.com/guide/spanish-subjunctive
http://www.spanishdict.com/topics/practice/76
https://conjuguemos.com/verb/129#

4) EL SUBJUNTIVO Y EL INDICATIVO (Contraste)
http://www.spanishdict.com/guide/subjunctive-vs-indicative-in-spanish
https://conjuguemos.com/grammar/241

5) EL IMPERFECTO DE SUBJUNTIVO
http://www.drlemon.net/Grammar/imp-subj.html
https://conjuguemos.com/verb/117

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