| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [is] essential that [adj] | 84 |
|
| 2 | [is] essential that [adj] [noun pl] | 32 |
|
| 3 | it [is] essential that [noun pl] | 28 |
|
| 4 | it [is] that [adj] [noun pl] | 6 |
|
