| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is [verb] that [adj] | 1006 |
|
| 2 | is necessary [verb] [adj] | 207 |
|
| 3 | is necessary [verb] that | 51 |
|
| 4 | necessary [verb] that [adj] | 30 |
|
