| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is necessary [verb] [noun pl] | 56 |
|
| 2 | is [verb] two [noun pl] | 55 |
|
| 3 | necessary [verb] two [noun pl] | 14 |
|
| 4 | is necessary [verb] two | 10 |
|
