| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have happened [prep] [art] | 48 |
|
| 2 | not have [prep] [art] | 26 |
|
| 3 | not have happened [prep] | 25 |
|
| 4 | not happened [prep] [art] | 7 |
|
