| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [be] essential that [det] [noun sg] | 17 |
|
| 2 | it be essential that [det] [noun sg] | 17 |
|
| 3 | it [is] essential that [det] [noun sg] | 14 |
|
| 4 | it is essential that [det] [noun sg] | 14 |
|
| 5 | it [be] essential that this [noun sg] | 9 |
|
