| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [is] that [det] [noun pl] | 372 |
|
| 2 | [is] essential that [det] | 60 |
|
| 3 | [is] essential that [noun pl] | 28 |
|
| 4 | essential that [det] [noun pl] | 24 |
|
