| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have [been] an accident | 47 |
|
| 2 | have been a accident | 47 |
|
| 3 | 's [been] a accident | 18 |
|
| 4 | had [been] a accident | 13 |
|
| 5 | have [been] a accident | 9 |
|
