| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb past] [pers pn] could [adv] [verb] | 767 |
|
| 2 | [vb past] [pers pn] could [adv] [vb infin] | 767 |
|
| 3 | [vb past] [pers pn] [modal v] [adv] have | 202 |
|
| 4 | [vb past] [pers pn] [vb mod] [adv] have | 202 |
|
| 5 | [verb] [pers pn] could [adv] have | 89 |
|
| 6 | [vb past] [pron] could [adv] have | 41 |
|
| 7 | [vb past] [pers pn] could [adv] have | 39 |
|
| 8 | [vb past] [pers pn] could [adv] have | 39 |
|
