| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [adv] [verb] [prep] [adj] | 608 |
|
| 2 | could [adv] [verb] [prep] [adj] | 266 |
|
| 3 | [modal v] only [verb] [prep] [adj] | 221 |
|
| 4 | could only [verb] [prep] [adj] | 46 |
|
