| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | to have [verb] | 14062 |
|
| 2 | to have [vb pp] | 12697 |
|
| 3 | [verb] occurred | 1631 |
|
| 4 | have occurred | 1622 |
|
| 5 | [to-vb] occurred | 113 |
|
| 6 | to have occur | 112 |
|
