| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it must have been [adv] | 118 |
|
| 2 | it must have [been] [adv] | 118 |
|
| 3 | it must have be [adv] | 118 |
|
| 4 | it must have [be] [adv] | 118 |
|
| 5 | it must have [verb] [adv] | 25 |
|
| 6 | it must have [vb pp] [adv] | 23 |
|
| 7 | it must have seemed [adv] | 5 |
|
| 8 | it must have seem [adv] | 5 |
|
| 9 | it must have [adv] [vb pp] | 8 |
|
| 10 | it must have [adv] [verb] | 8 |
|
