| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is essential that [det] | 58 |
|
| 2 | it [is] essential that all | 18 |
|
| 3 | it [is] essential that this | 12 |
|
| 4 | it [is] essential that these | 7 |
|
| 5 | it [is] essential that such | 5 |
|
| 6 | it [is] essential that any | 5 |
|
