| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] [is] it necessary | 21 |
|
| 2 | [adv] is [pron] necessary | 21 |
|
| 3 | [adv] [is] it necessary | 21 |
|
| 4 | [adv] [is] [pers pn] necessary | 21 |
|
| 5 | [Wh adv] [is] [pron] necessary | 14 |
|
| 6 | why [is] [pron] necessary | 14 |
|
| 7 | why [is] [pron] necessary | 14 |
|
| 8 | [adv] [is] [pron] necessary | 6 |
|
