| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it must [verb] [been] [prep] | 83 |
|
| 2 | [coord] it must [verb] [been] | 56 |
|
| 3 | [coord] it [verb] [been] [prep] | 31 |
|
| 4 | [coord] it must [verb] [prep] | 12 |
|
