| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [Wh det] could [adv] | 544 |
|
| 2 | [det] could [adv] | 408 |
|
| 3 | [det] [Wh det] [adv] | 114 |
|
| 4 | [det] [Wh det] could | 37 |
|
