| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] [been] for [noun] | 120 |
|
| 2 | [verb] [been] necessary for | 25 |
|
| 3 | [verb] necessary for [noun] | 12 |
|
| 4 | [been] necessary for [noun] | 8 |
|
