| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is [verb] that [det] | 528 |
|
| 2 | it is necessary [verb] [det] | 80 |
|
| 3 | it is necessary [verb] that | 43 |
|
| 4 | is necessary [verb] that [det] | 6 |
|
