| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [adv] [verb] [prep] a | 329 |
|
| 2 | [adv] [verb] on [prep] a | 112 |
|
| 3 | could [adv] [verb] on [prep] | 61 |
|
| 4 | could [verb] on [prep] a | 15 |
|
