| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [adv] [verb] [noun] | 1738 |
|
| 2 | could [adv] [verb] [noun] | 813 |
|
| 3 | [modal v] only [verb] [noun] | 601 |
|
| 4 | could only [verb] [noun] | 112 |
|
