| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] [verb] [been] necessary [to-vb] | 28 |
|
| 2 | [pron] [verb] not [been] [to-vb] | 13 |
|
| 3 | [pron] [verb] not [been] necessary | 8 |
|
| 4 | [verb] not [been] necessary [to-vb] | 7 |
|
