| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [vb mod] [vb infin] been some | 18 |
|
| 2 | it [vb mod] have been some | 18 |
|
| 3 | it [vb mod] have been some | 17 |
|
| 4 | it must [verb] been some | 12 |
|
