http://a4esl.org/q/h/lb/psnv.html
Read the story and try the test : http://www.english-test.net/lessons/1/index.html
http://www.englisch-hilfen.de/en/exercises/tenses/simple_present_negation_sentences.htm
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http://a4esl.org/q/h/lb/psnv.html
Read the story and try the test : http://www.english-test.net/lessons/1/index.html
http://www.englisch-hilfen.de/en/exercises/tenses/simple_present_negation_sentences.htm