| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pers pn] must have [been] [prep] [prep] | 7 |
|
| 2 | [pers pn] must have [been] [prep] [prep] | 7 |
|
| 3 | [pron] must have [been] [prep] for | 5 |
|
| 4 | [pers pn] must have [be] [prep] for | 5 |
|
| 5 | [pers pn] must have [been] [prep] for | 5 |
|
| 6 | [pers pn] [modal v] have [been] [prep] for | 5 |
|
| 7 | [pers pn] must [verb] [been] [prep] for | 5 |
|
