| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb -s] a [adj] role [prep] | 285 |
|
| 2 | [vb -s] a [adj] role [prep] | 279 |
|
| 3 | [vb -s] a essential [noun] [prep] | 34 |
|
| 4 | [verb] a essential role [prep] | 17 |
|
| 5 | [vb -s] [art] essential role [prep] | 7 |
|
| 6 | [vb -s] a essential role [prep] | 6 |
|
| 7 | [vb -s] a essential role [prep] | 6 |
|
