No | Pattern | Freq | Relations |
---|---|---|---|
1 | [Wh det] must have been a [noun] | 5 |
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2 | [Wh det] must [vb infin] been a [noun] | 5 |
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3 | [Wh det] must [verb] been a [noun sg] | 5 |
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4 | [Wh det] must have been a [noun] | 5 |
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