| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [is] [adj] for [v-ing] | 654 |
|
| 2 | [is] essential [prep] [v-ing] | 39 |
|
| 3 | [is] essential [prep] [v-ing] | 39 |
|
| 4 | [be] essential for [v-ing] | 39 |
|
| 5 | [is] essential for [verb] | 20 |
|
| 6 | [is] essential for [v-ing] | 20 |
|
