| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] must have [been] [v-ing] for | 15 |
|
| 2 | [pron] must [verb] [been] [v-ing] for | 15 |
|
| 3 | [pron] must have [been] [v-ing] for | 15 |
|
| 4 | [pron] must [verb] been [v-ing] for | 15 |
|
| 5 | [pers pn] must [verb] [been] [v-ing] for | 15 |
|
| 6 | [pron] must [vb infin] [been] [v-ing] for | 15 |
|
| 7 | she must [verb] [been] [v-ing] for | 5 |
|
| 8 | she must [verb] [been] [v-ing] for | 5 |
|
