Four types of conditionals
http://uploadingit.com/file/mzpwqdon...%20al-oufi.pdf
exercises
http://uploadingit.com/file/5poxie9z...%20al-oufi.pdf
exercises with answers
http://uploadingit.com/file/exeb1gur...%20al-oufi.pdf
Four types of conditionals by al-oufi
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