| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [verb] [pron] [adv] | 834 |
|
| 2 | [verb] [pron] [adv] a | 541 |
|
| 3 | could [verb] [pron] a | 287 |
|
| 4 | could [verb] [adv] a | 93 |
|
