| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] it essential that [noun pl] | 5 |
|
| 2 | it [be] essential that [noun pl] | 29 |
|
| 3 | it be essential that [noun pl] | 29 |
|
| 4 | it [is] essential that [noun pl] | 28 |
|
| 5 | it is essential that [noun pl] | 27 |
|
