No | Pattern | Freq | Relations |
---|---|---|---|
1 | must have been [verb] [prep] a | 36 |
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2 | must have been [verb] [prep] a | 36 |
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3 | must have been [vb pp] [prep] a | 31 |
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4 | must have been [verb] by a | 12 |
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5 | must have been [verb] by a | 12 |
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6 | must have been [verb] for a | 6 |
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7 | must have been [verb] for a | 6 |
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8 | must have been [v-ing] [prep] a | 5 |
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