Passive Voice

 
Voz passiva ou passive voice é um tópico gramatical de costuma assustar os estudantes brasileiros. No entanto, há 4 dicas básicas e 1 tabela que vão facilitar a sua vida e acabar com esse “dilema”:
A primeira dica é “você sempre vai precisar inserir o verbo to be em todas as frases na voz passiva”;
A segunda dica é “você sempre precisará manter o verbo principal (o verbo da frase na voz ativa) no past participle“, localizado na terceira coluna da famosa tabelinha de verbos irregulares. Exemplo: na frase “I read a book”, o verbo da frase na voz ativa é “read”, então ele vai para o past participle;
A terceira dica é “sempre manter o tempo verbal da frase”. A frase acima “I read a book”, está no presente, por isso, esta frase na voz passiva terá o verbo to be no presente;
E a quarta, “começar a frase pelo objeto do verbo”, ou seja, a informação que o verbo dá.
Vamos então a um exemplo prático. Veja a frase:

Tense		Subject	Verb	Object
Simple Present	Active:	Rita	writes	a letter.
	Passive:	A letter	is written	by Rita.
Simple Past	Active:	Rita	wrote	a letter.
	Passive:	A letter	was written	by Rita.
Present Perfect	Active:	Rita	has written	a letter.
	Passive:	A letter	has been written	by Rita.
Future I	Active:	Rita	will write	a letter.
	Passive:	A letter	will be written	by Rita.
Modal “can”	Active:	Rita	can write	a letter.
	Passive:	A letter	can be written	by Rita.

Tense		Subject	Verb	Object
Present Progressive	Active:	Rita	is writing	a letter.
	Passive:	A letter	is being written	by Rita.
Past Progressive	Active:	Rita	was writing	a letter.
	Passive:	A letter	was being written	by Rita.
Past Perfect	Active:	Rita	had written	a letter.
	Passive:	A letter	had been written	by Rita.
Future II	Active:	Rita	will have written	a letter.
	Passive:	A letter	will have been written	by Rita.
Conditional I	Active:	Rita	would write	a letter.
	Passive:	A letter	would be written	by Rita.
Conditional II	Active:	Rita	would have written	a letter.
	Passive:	A letter	would have been written	by Rita.

Pessoal,
acessem os links abaixo para os exercicios.
Enjoy the time!!!

http://www.ecenglish.com/learnenglish/lessons/do-you-know-how-make-passive-sentences

http://www.english-grammar-lessons.com/passive/exercise2.swf

http://www.english-grammar-lessons.com/passive/exercise3.swf

http://suz.digitaleschulebayern.de/english/grammar/passive4.htm

http://www.learnenglishfeelgood.com/esl-passive-voice-exercise2.html

http://www.englishexercises.net/yypassive1.html

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