| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have been [prep] some [noun] | 88 |
|
| 2 | must have been [prep] [noun] | 39 |
|
| 3 | must have been some [noun] | 34 |
|
| 4 | must have been [prep] some | 6 |
|
