| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is [adv] essential [verb] [prep] | 7 |
|
| 2 | it is [adv] essential [verb] [prep] | 6 |
|
| 3 | it is essential [verb] [noun] [prep] | 10 |
|
| 4 | it is essential [verb] [noun sg] [prep] | 7 |
|
| 5 | it is essential [verb] [prep] [art] | 12 |
|
| 6 | it is essential [verb] [prep] [art] | 12 |
|
| 7 | it is essential [verb] [prep] [noun] | 9 |
|
| 8 | it is essential [verb] [prep] the | 8 |
|
| 9 | it is essential [verb] [prep] the | 8 |
|
| 10 | it is essential [verb] [prep] [noun sg] | 8 |
|
