| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is essential that [adj] | 81 |
|
| 2 | is essential that [adj] [noun pl] | 31 |
|
| 3 | it is essential that [noun pl] | 27 |
|
| 4 | it is that [adj] [noun pl] | 6 |
|
