| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it has been [adj] for | 52 |
|
| 2 | it has [been] [adj] for | 51 |
|
| 3 | it has [been] possible for | 9 |
|
| 4 | it has [been] possible for | 9 |
|
| 5 | it has [been] clear for | 5 |
|
| 6 | it has [been] necessary for | 5 |
|
| 7 | it has [been] clear for | 5 |
|
| 8 | it has [been] necessary for | 5 |
|
