| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] which [modal v] [be] [verb] | 4055 |
|
| 2 | problem [pron] [modal v] [be] [verb] | 48 |
|
| 3 | problem which [modal v] [be] [verb] | 37 |
|
| 4 | problem [Wh det] [modal v] [be] [verb] | 37 |
|
