sentence connectors and conjunctions

http://www.esltower.com/GRAMMARQUIZ/intermediate/conjunctions%20so,%20until,because,%20when.htm
http://www.curso-ingles.com/gramatica-inglesa/conjunciones.php
http://esl.about.com/od/writingadvanced/a/wc_comparison.htm
https://www.dlsweb.rmit.edu.au/lsu/content/4_writingskills/writing_tuts/linking_LL/sentence.html

text2mindmap.com/zeULzB

text2mindmap.com/zeULzB