ECL "English as a crucial language"
Cambridge Advanced Learner’s Dictionary – Electronic Edition. Version 1.1.
Courtney, Rosemary - Longman Dictionary of Phrasal Verbs.
Fisk English Course – Books – Basic one / two, Book four, Book five, Book six
Advanced two, Free Conversation.
Dictionary of English Idioms.
Serpa, Oswaldo – Gramática da Língua Inglesa. Rio de Janeiro 1966.
Swan, Michael and Walter, Catherine – How English Works – A Grammar P
Book With Answers. Oxford.
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