| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | may [adv] have contribute to | 16 |
|
| 2 | may [adv] have contributed to | 16 |
|
| 3 | may [adv] have contribute to | 16 |
|
| 4 | may well have contribute to | 8 |
|
| 5 | may also have contribute to | 7 |
|
