| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [adv] [prep] [art] | 51 |
|
| 2 | could [adv] [prep] [art] | 51 |
|
| 3 | [modal v] [adv] [prep] a | 49 |
|
| 4 | could [adv] [prep] a | 10 |
|
