| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] [pron] could [verb] [pron] | 878 |
|
| 2 | [verb] [pron] could [vb infin] [pron] | 875 |
|
| 3 | [verb] [pron] [modal v] have [pron] | 220 |
|
| 4 | [verb] [pron] could have [pron] | 34 |
|
