| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [is] necessary [verb] | 1094 |
|
| 2 | it [is] sometimes [verb] | 215 |
|
| 3 | it [is] sometimes necessary | 12 |
|
| 4 | [is] sometimes necessary [verb] | 11 |
|
