| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] [pron] must have [been] | 125 |
|
| 2 | [pron] must have [been] [det] | 78 |
|
| 3 | [noun] [pron] must have [det] | 8 |
|
| 4 | [noun] must have [been] [det] | 8 |
|
