| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] must have been [v-ing] for | 15 |
|
| 2 | [pers pn] must have been [v-ing] for | 15 |
|
| 3 | she must have been [v-ing] for | 5 |
|
| 4 | she must have been [v-ing] for | 5 |
|
| 5 | must have been [v-ing] [pron] for | 6 |
|
