| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | play a central role in the | 25 |
|
| 2 | [to-vb] a central role in the | 7 |
|
| 3 | [vb pp] a central role in the | 7 |
|
| 4 | to play a central role in the | 6 |
|
| 5 | [vb past] a central role in the | 5 |
|
| 6 | play a central role in the | 5 |
|
| 7 | [vb infin] a central role in the | 5 |
|
