| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is [adj] for [verb] | 618 |
|
| 2 | is essential [prep] [verb] | 39 |
|
| 3 | be essential for [verb] | 39 |
|
| 4 | [be] essential for [verb] | 39 |
|
| 5 | [is] essential for [verb] | 20 |
|
