| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [Wh det] [modal v] cause [adj] problem | 5 |
|
| 2 | [Wh det] [vb mod] cause [adj] problem | 5 |
|
| 3 | [Wh det] [modal v] cause [adj] problems | 5 |
|
| 4 | which [modal v] cause [adj] problem | 5 |
|
