| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] [modal v] have been [prep] | 693 |
|
| 2 | [pron] must have be [prep] | 180 |
|
| 3 | [pron] must have [be] [prep] | 180 |
|
| 4 | [pron] must have [been] [prep] | 180 |
|
| 5 | [pron] must [verb] been [prep] | 180 |
|
