| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [pers pn] [adv] [vb infin] | 576 |
|
| 2 | [Wh det] could [pers pn] [vb infin] | 242 |
|
| 3 | [Wh det] could [adv] [vb infin] | 225 |
|
| 4 | [Wh det] could [pers pn] [adv] | 16 |
|
