| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [is] [verb] [det] [noun pl] | 377 |
|
| 2 | [is] necessary [verb] [det] | 103 |
|
| 3 | necessary [verb] [det] [noun pl] | 60 |
|
| 4 | [is] necessary [verb] [noun pl] | 58 |
|
