| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have been caused [prep] a | 35 |
|
| 2 | have been cause by a | 33 |
|
| 3 | have been cause [prep] a | 12 |
|
| 4 | to have been cause [prep] a | 9 |
|
| 5 | had been cause [prep] a | 8 |
|
| 6 | has been cause [prep] a | 5 |
|
