| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must have been a [noun] | 179 |
|
| 2 | must have been [num] [noun] | 23 |
|
| 3 | have been a [num] [noun] | 13 |
|
| 4 | must have been a [num] | 12 |
|
