| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] [noun] could | 6366 |
|
| 2 | [noun] problem [vb mod] | 165 |
|
| 3 | [noun] problem [modal v] | 165 |
|
| 4 | [noun] problem could | 16 |
|
