| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [is] essential that [det] [noun pl] | 22 |
|
| 2 | it is essential [that] [det] [noun pl] | 22 |
|
| 3 | it [is] essential [that] all [noun pl] | 11 |
|
| 4 | it [is] essential [that] these [noun pl] | 5 |
|
