| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [is] necessary [to-vb] [prep] the | 52 |
|
| 2 | is necessary [verb] [prep] the | 51 |
|
| 3 | [is] necessary [verb] to the | 13 |
|
| 4 | [is] necessary [verb] at the | 7 |
|
| 5 | [is] necessary to look [prep] the | 7 |
|
| 6 | [is] necessary look [prep] the | 7 |
|
| 7 | [is] necessary [verb] for the | 7 |
|
