Knowledge button in the main bar to grammar. About lessons and exercises I haven´t seen.

You can find grammar in the Knowledge section as Mendez stated. As for the lessons you can search for teachers on 'language teachers' .

Hi, these Italki English/Portuguese speaking language partners can be contacted by you to set up a practice time. Be aware of time differences between countries. Go to: http://www.italki.com/partners/1-Portuguese-English200-00-0.htm You can also learn English using Portuguese as your base language here at Italki. Go to: http://www.italki.com/knowledge/learn-English-Portuguese.htm

http://www.italki.com/resources/english/documents http://www.italki.com/resources/english/videos http://www.italki.com/resources/english/podcasts http://www.italki.com/knowledge/english