| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is [verb] that [adj] [noun pl] | 281 |
|
| 2 | is necessary [verb] [adj] [noun pl] | 63 |
|
| 3 | is necessary [verb] that [adj] | 13 |
|
| 4 | necessary [verb] that [adj] [noun pl] | 12 |
|
