| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | may [adv] have [verb] to | 72 |
|
| 2 | [vb mod] [adv] have contribute to | 18 |
|
| 3 | [modal v] [adv] have contribute to | 18 |
|
| 4 | may [adv] have contribute to | 16 |
|
| 5 | may [adv] [verb] contribute to | 16 |
|
| 6 | may [adv] have contribute [prep] | 16 |
|
