| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have an important role to play in | 40 |
|
| 2 | have an important role to play [prep] | 18 |
|
| 3 | has an important role to play [prep] | 12 |
|
| 4 | had an important role to play [prep] | 7 |
|
