No | Pattern | Freq | Relations |
---|---|---|---|
1 | must have [been] [verb] [det] | 17 |
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2 | must have been [verb] [det] | 17 |
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3 | must have [been] [verb] [det] | 17 |
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4 | must have [been] [v-ing] [det] | 12 |
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5 | must have [been] [verb] all | 5 |
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