| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] must have been [adv] | 308 |
|
| 2 | [pers pn] must have been [adv] | 268 |
|
| 3 | i [modal v] have been [adv] | 151 |
|
| 4 | i must [vb infin] been [adv] | 28 |
|
| 5 | i must have been [adv] | 28 |
|
| 6 | i must [verb] been [adv] | 28 |
|
| 7 | i must have been [adv] | 27 |
|
| 8 | i must have [been] [adv] | 27 |
|
| 9 | i must have be [adv] | 27 |
|
| 10 | i must have [be] [adv] | 27 |
|
