| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is essential that [adj] | 81 |
|
| 2 | is essential that [adj] [noun] | 58 |
|
| 3 | it is essential that [noun] | 55 |
|
| 4 | it is that [adj] [noun] | 17 |
|
