| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [verb] [pers pn] [verb] | 994 |
|
| 2 | could [verb] [pers pn] [vb infin] | 203 |
|
| 3 | [modal v] [verb] [pers pn] have | 145 |
|
| 4 | could [verb] [pers pn] have | 121 |
|
| 5 | could [verb] [pron] have | 21 |
|
