Conjugación del verbo regular 'to be' en inglés en perfect continuous
0 8 词汇卡 缺乏
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1. persona singular, perfect continuous, indicative
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2. persona singular, perfect continuous, indicative
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3. persona singular, perfect continuous, indicative
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3. persona singular, perfect continuous, indicative
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3. persona singular, perfect continuous, indicative
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1. persona plural, perfect continuous, indicative
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2. persona plural, perfect continuous, indicative
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3. persona plural, perfect continuous, indicative
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