| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have [been] [prep] [det] [noun] | 76 |
|
| 2 | must have [been] [det] [noun] | 49 |
|
| 3 | must have [been] [prep] [noun] | 39 |
|
| 4 | must have [been] [prep] [det] | 26 |
|
