| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] must [verb] been | 1981 |
|
| 2 | [pron] [verb] been for | 216 |
|
| 3 | [pron] must [verb] for | 196 |
|
| 4 | must [verb] been for | 14 |
|
