| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adj] problem which could | 8 |
|
| 2 | [adj] problem which could | 7 |
|
| 3 | problem which could [vb infin] | 8 |
|
| 4 | problem which could [verb] | 8 |
|
| 5 | problem which could [be] | 5 |
|
| 6 | problem which could be | 5 |
|
| 7 | problem which could be | 5 |
|
| 8 | problem which could [be] | 5 |
|
