No | Pattern | Freq | Relations |
---|---|---|---|
1 | could have [been] [verb] for a | 6 |
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2 | could have [be] [verb] for a | 6 |
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3 | could have be [verb] for a | 6 |
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4 | could have been [verb] for a | 6 |
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5 | could have [be] [vb pp] for a | 6 |
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