| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] was it necessary | 6 |
|
| 2 | why was it necessary | 5 |
|
| 3 | why was it necessary | 5 |
|
| 4 | [Wh adv] was it necessary | 5 |
|
| 5 | was it necessary [verb] | 9 |
|
| 6 | was it necessary [to-vb] | 9 |
|
