Membranes–how they work, what they do
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<ul><li><p> Nature Publishing Group1983</p></li><li><p> Nature Publishing Group1983</p></li></ul>
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VERB TENSES REVIEW. SIMPLE PRESENT They work hard every day They work hard every day Do they work...? Do they work...? They don´t work... He works hard.
Present simple and continuous Present simple Form: He/she/it works. I work. They work He doesn’t work. They don’t work. Does he work? Do they work? Use: