| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | may have [verb] [prep] [art] | 399 |
|
| 2 | [modal v] have contribute [prep] [art] | 58 |
|
| 3 | may [verb] contribute [prep] [art] | 39 |
|
| 4 | may [vb infin] contribute [prep] [art] | 39 |
|
| 5 | may have contribute [prep] [art] | 39 |
|
