| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must have been [adv] [adj] | 321 |
|
| 2 | [vb mod] have been [adv] [det] | 71 |
|
| 3 | [modal v] have been [adv] [det] | 71 |
|
| 4 | must have been [adv] [det] | 13 |
|
| 5 | must [verb] been [adv] [det] | 12 |
|
| 6 | must have [been] [adv] [det] | 12 |
|
| 7 | must have been [adv] [det] | 12 |
|
| 8 | must have [be] [adv] [det] | 12 |
|
| 9 | must have be [adv] [det] | 12 |
|
