| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [verb] [pers pn] [adv] | 1225 |
|
| 2 | could [vb infin] [pers pn] [adv] | 1219 |
|
| 3 | [modal v] have [pers pn] [adv] | 210 |
|
| 4 | could have [pron] [adv] | 14 |
|
| 5 | could have [pers pn] [adv] | 10 |
|
