| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could have [vb pp] a | 273 |
|
| 2 | could have had a | 61 |
|
| 3 | could have [vb pp] an | 45 |
|
| 4 | could have made a | 35 |
|
| 5 | could have heard a | 9 |
|
| 6 | could have got a | 9 |
|
| 7 | could have done a | 9 |
|
| 8 | could have provided a | 7 |
|
| 9 | could have given a | 7 |
|
| 10 | could have taken a | 7 |
|
| 11 | could have become a | 7 |
|
| 12 | could have caused a | 5 |
|
