| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | might have [verb] | 4339 |
|
| 2 | [modal v] have occur | 152 |
|
| 3 | might [vb infin] occur | 19 |
|
| 4 | might have occur | 19 |
|
| 5 | might [verb] occur | 19 |
|
