| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [is] [adv] necessary [verb] | 479 |
|
| 2 | it [is] [adv] necessary [verb] | 296 |
|
| 3 | it [is] sometimes [adj] [verb] | 113 |
|
| 4 | [pron] [is] sometimes necessary [verb] | 10 |
|
| 5 | [pers pn] [is] sometimes necessary [verb] | 10 |
|
| 6 | it [is] sometimes necessary [verb] | 10 |
|
| 7 | it [is] sometimes necessary [verb] | 10 |
|
| 8 | it [be] sometimes necessary [verb] | 10 |
|
