| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is essential [that] [noun] | 55 |
|
| 2 | is essential [that] [noun] [verb] | 20 |
|
| 3 | it is [that] [noun] [verb] | 17 |
|
| 4 | it is essential [that] [verb] | 7 |
|
