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In the English Grammar Profile, there are two points that overlap.  B2 point 55 is defined as: PAST simple after ‘if’ as a politeness structure, especially in letters and emails. B2 point 72 is defined as: the past simple with a range of subordinating conjunctions, including ‘as soon as’, ‘before’, ‘if’, ‘once’, ‘since’, ‘so’, ‘until’, […]