| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [is] essential that they [verb] | 8 |
|
| 2 | it [is] essential that they [verb] | 8 |
|
| 3 | it [is] essential that they [verb] | 8 |
|
| 4 | it [is] essential that they [vb base] | 8 |
|
| 5 | it is essential that they [verb] | 8 |
|
