Passive voice

Here are some exercises so you can practice:

Simple Present: http://www.ego4u.com/en/cram-up/grammar/passive/exercises

Simple Past: http://www.ego4u.com/en/cram-up/grammar/passive/exercises?02

Preactice these plurals

Tag questions

If you need to practice more tag questions follow this link:

http://www.english-zone.com/grammar/tags01.html

http://www.englishclub.com/grammar/verbs-questions-tag_quiz.htm

http://www.englishexercises.org/makeagame/viewgame.asp?id=2520

Books for free

Here is another site where you can find books for free.

http://www.epubbooks.com/

The boks have a EPUB extension and you need an application to read them. You have to download and install a program to read them. Here you can find one.

http://www.adobe.com/es/products/digitaleditions/#fp

Books for free

If you want to read a book, just choose one:

http://www.feedbooks.com/

Coose your books from Public Domain.

English Attack

A interesting site to learn English if you like movies

http://es.english-attack.com/