| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | which have caused | 143 |
|
| 2 | [Wh det] had caused | 87 |
|
| 3 | [Wh det] has caused | 66 |
|
| 4 | what have caused | 43 |
|
| 5 | [Wh det] have caused | 27 |
|
| 6 | [Wh det] 's caused | 6 |
|
