No | Pattern | Freq | Relations |
---|---|---|---|
1 | must [vb infin] been [prep] some [noun] | 6 | |
2 | must have been [prep] some [noun] | 6 | |
3 | must [verb] been [prep] some [noun] | 6 | |
4 | must have been [prep] some [noun] | 6 | |
5 | must [verb] been [prep] some [noun] | 6 | |
6 | must [verb] been [prep] some [noun sg] | 5 |