| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun pl] must [verb] been a [noun] | 5 |
|
| 2 | [noun pl] must [vb infin] [be] a [noun] | 5 |
|
| 3 | [noun pl] must [verb] [be] a [noun sg] | 5 |
|
| 4 | [noun pl] must [verb] [been] a [noun] | 5 |
|
| 5 | [noun pl] must have [be] a [noun] | 5 |
|
| 6 | [noun pl] must [verb] be a [noun] | 5 |
|
| 7 | [noun pl] must have [be] a [noun] | 5 |
|
