| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb mod] be caused [prep] [adj] | 32 |
|
| 2 | [modal v] be caused by [adj] | 31 |
|
| 3 | may be caused [prep] [adj] | 15 |
|
| 4 | may be caused [prep] [adj] | 15 |
|
| 5 | can be caused [prep] [adj] | 12 |
|
| 6 | can be caused [prep] [adj] | 12 |
|
