Present Perfect vs. Past Simple (since/for)
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Past Continuous
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Present Perfect (ever/never/yet/already/still/just)
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some/any/how much/how many/too much/too many/a few/a little/ few/little/ a lot of
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Past Simple
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Present Simple
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Comparatives and superlatives (adjectives and adverbs)
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going to/will/present continuous
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Conditionals (0, 1st, 2nd)
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Present Continuous
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