| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have been [det] [noun] [prep] | 98 |
|
| 2 | must have been [det] [noun] | 49 |
|
| 3 | must have [det] [noun] [prep] | 47 |
|
| 4 | must have been [noun] [prep] | 29 |
|
