| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] could [vb infin] | 19151 |
|
| 2 | problem [vb mod] [vb infin] | 421 |
|
| 3 | problem [modal v] [vb infin] | 421 |
|
| 4 | problem could [verb] | 32 |
|
| 5 | problem could [vb infin] | 32 |
|
