| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pers pn] is essential for [noun] [verb] | 6 |
|
| 2 | it is essential for [noun] [verb] | 6 |
|
| 3 | [pron] is essential for [noun] [to-vb] | 6 |
|
| 4 | it is essential for [noun] [verb] | 6 |
|
| 5 | [pron] is essential for [noun pl] [verb] | 5 |
|
