English verb 'to happen' in perfect continuous - regular verbs conjugation
0 8 flashcards lack
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1st person singular, perfect continuous, indicative
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2nd person singular, perfect continuous, indicative
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3rd person singular, perfect continuous, indicative
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3rd person singular, perfect continuous, indicative
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3rd person singular, perfect continuous, indicative
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1st person plural, perfect continuous, indicative
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2nd person plural, perfect continuous, indicative
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3rd person plural, perfect continuous, indicative
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