SOME HELP FOR DOUBLE PASSIVE AND IMPERSONAL PASSIVE

DOUBLE PASSIVE

http://www.perfect-english-grammar.com/passive-verbs-two-objects-exercise-1.html

https://engelsklaslokaal.nl/en/english-grammar-exercises/passive/double-object-passive/

http://www.aprenderinglesfacil.es/2010/05/exercises-voz-pasiva-con-dos-objetos-iv.html

http://www.aprenderinglesfacil.es/2010/04/passive-voice-with-two-objects-voz.html

http://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-4216.php

IMPERSONAL PASSIVE

http://passivecausality.weebly.com/personal-and-impersonal-constructions.html

http://www.englisch-hilfen.de/en/grammar/personal_passive.htm

http://www.aprenderinglesfacil.es/2010/05/exercises-voz-pasiva-impersonal-iii.html

https://english.lingolia.com/en/grammar/verbs/passive-voice/exercises