| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [ex0] [verb] been a [noun] | 1245 |
|
| 2 | must [verb] been a [noun] | 181 |
|
| 3 | [ex0] must [verb] been a | 75 |
|
| 4 | [ex0] must [verb] been [noun] | 21 |
|
| 5 | [ex0] must [verb] a [noun] | 14 |
|
