| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [Wh det] [vb mod] contribute to | 32 |
|
| 2 | [Wh det] [vb mod] contribute to | 32 |
|
| 3 | which [vb mod] contribute to | 32 |
|
| 4 | [Wh det] may contribute to | 10 |
|
| 5 | [Wh det] will contribute to | 8 |
|
| 6 | [Wh det] might contribute to | 5 |
|
