No | Pattern | Freq | Relations |
---|---|---|---|
1 | [verb] been [verb] [prep] twenty years | 9 |
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2 | have been [verb] [prep] twenty years | 9 |
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3 | [vb -s] been [verb] [prep] twenty years | 5 |
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4 | has been [verb] [prep] twenty years | 5 |
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