| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [vb mod] [verb] been a | 481 |
|
| 2 | it [modal v] [vb infin] been a | 481 |
|
| 3 | it [modal v] have been a | 481 |
|
| 4 | it [modal v] have been a | 470 |
|
| 5 | it would [verb] been a | 151 |
|
| 6 | it would [verb] been a | 150 |
|
| 7 | it must [verb] been a | 136 |
|
| 8 | it must [verb] been a | 136 |
|
| 9 | it could [verb] been a | 73 |
|
| 10 | it could [verb] been a | 73 |
|
| 11 | it might [verb] been a | 52 |
|
| 12 | it might [verb] been a | 52 |
|
| 13 | it may [verb] been a | 36 |
|
| 14 | it may [verb] been a | 36 |
|
| 15 | it should [verb] been a | 30 |
|
| 16 | it should [verb] been a | 30 |
|
| 17 | it [modal v] 've been a | 11 |
|
