| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have been a [adj] [noun] | 757 |
|
| 2 | must have been a [adj] | 201 |
|
| 3 | must have a [adj] [noun] | 188 |
|
| 4 | must have been a [noun] | 179 |
|
| 5 | must have been [adj] [noun] | 116 |
|
