Author's Instructions
Principal sources: Swan, Practical English Usage, 3rd ed., 2005; http://wordwizard.com/phpbb3/viewtopic.php?t=8473;
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SMT-progressive vs non-progressive verbs
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Author's Instructions
Principal sources: Swan, Practical English Usage, 3rd ed., 2005; http://wordwizard.com/phpbb3/viewtopic.php?t=8473;