| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | play a central role in [v-ing] | 11 |
|
| 2 | [vb infin] a central role in [v-ing] | 6 |
|
| 3 | [vb past] a central role in [v-ing] | 5 |
|
| 4 | played a central role in [v-ing] | 5 |
|
