| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it have been [adj] for | 115 |
|
| 2 | it has been [adj] for | 51 |
|
| 3 | it had been [adj] for | 42 |
|
| 4 | it 's been [adj] for | 21 |
|
| 5 | it have been possible for | 15 |
|
| 6 | it have been necessary for | 9 |
|
| 7 | it have been clear for | 7 |
|
| 8 | it have been good for | 6 |
|
| 9 | it have been responsible for | 6 |
|
