| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pers pn] has been necessary for | 5 |
|
| 2 | it has be necessary for | 5 |
|
| 3 | [pers pn] has be necessary for | 5 |
|
| 4 | [pers pn] has be necessary for | 5 |
|
