| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [is] essential [prep] [noun sg] [verb] | 13 |
|
| 2 | [is] essential [prep] [noun sg] [verb] | 13 |
|
| 3 | is essential [prep] [noun sg] [verb] | 13 |
|
| 4 | [is] essential [prep] [noun sg] [to-vb] | 10 |
|
| 5 | [is] essential in [noun sg] [verb] | 9 |
|
| 6 | [is] essential in [noun sg] [verb] | 9 |
|
| 7 | [is] essential [prep] order [verb] | 9 |
|
