| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have occur [prep] the past | 8 |
|
| 2 | have occur [prep] the past | 8 |
|
| 3 | have occurred [prep] [art] past | 8 |
|
| 4 | have occur [prep] [art] past | 8 |
|
| 5 | have occur [prep] [art] past | 8 |
|
| 6 | have occur in [art] past | 7 |
|
