| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] must [verb] been [adj] | 446 |
|
| 2 | [verb] [pron] [verb] been [adj] | 400 |
|
| 3 | [verb] [pron] must [verb] been | 170 |
|
| 4 | [verb] [pron] must [verb] [adj] | 91 |
|
