| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it has been | 5229 |
|
| 2 | it had been | 4201 |
|
| 3 | it 's been | 2059 |
|
| 4 | it have been | 108 |
|
| 5 | it 'd been | 42 |
|
| 6 | it have been | 26 |
|
| 7 | it to have been | 26 |
|
| 8 | it having been | 13 |
|
