| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it must have been [pron] [prep] | 10 |
|
| 2 | it must [verb] been [pron] [prep] | 10 |
|
| 3 | it must have been [pron] [prep] | 10 |
|
| 4 | it must [vb infin] been [pron] [prep] | 10 |
|
| 5 | it must [verb] been [indef pn] [prep] | 10 |
|
| 6 | it must [verb] been something [prep] | 5 |
|
| 7 | it must [verb] been something [prep] | 5 |
|
