| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb pp] to have been cause [prep] | 17 |
|
| 2 | [vb pp] to have been caused [prep] | 17 |
|
| 3 | [vb pp] to have been cause by | 15 |
|
| 4 | [vb pp] to have been cause by | 15 |
|
| 5 | thought to have been cause [prep] | 7 |
|
