| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | accident happened [prep] | 72 |
|
| 2 | accident happened on | 27 |
|
| 3 | accident happened on | 27 |
|
| 4 | accident happened at | 24 |
|
| 5 | accident happened at | 24 |
|
| 6 | accident happened in | 7 |
|
| 7 | accident happened in | 7 |
|
| 8 | accident happened during | 5 |
|
| 9 | accident happened during | 5 |
|
