No | Pattern | Freq | Relations |
---|---|---|---|
1 | which have been [verb] for a | 14 |
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2 | which have been [verb] for a | 14 |
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3 | which have been [vb pp] for a | 9 |
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4 | which has been [verb] for a | 7 |
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5 | which had been [verb] for a | 6 |
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6 | which have been [v-ing] for a | 5 |
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