| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [Wh det] [vb mod] [verb] problems | 24 |
|
| 2 | [Wh det] [modal v] [vb infin] problems | 24 |
|
| 3 | which [modal v] [verb] problems | 23 |
|
| 4 | [Wh det] [modal v] cause problems | 16 |
|
| 5 | [Wh det] [modal v] cause problems | 16 |
|
| 6 | [Wh det] may [verb] problems | 9 |
|
| 7 | [Wh det] may [verb] problems | 9 |
|
| 8 | [Wh det] can [verb] problems | 6 |
|
| 9 | [Wh det] can [verb] problems | 6 |
|
