| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] [is] essential that [noun] | 56 |
|
| 2 | [pron] [is] that a [noun] | 37 |
|
| 3 | [pron] [is] essential that a | 17 |
|
| 4 | [is] essential that a [noun] | 10 |
|
