| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] [modal v] have [been] [adv] | 1330 |
|
| 2 | [pron] must have [been] [adv] | 308 |
|
| 3 | [pron] must [verb] [been] [adv] | 293 |
|
| 4 | [pron] must [vb infin] [been] [adv] | 293 |
|
| 5 | [pron] must have [been] [adv] | 293 |
|
| 6 | [pron] must have [be] [adv] | 283 |
|
