| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb mod] have had a | 454 |
|
| 2 | [modal v] have had a | 454 |
|
| 3 | could have [verb] a | 273 |
|
| 4 | could have [vb pp] a | 273 |
|
| 5 | could have had [art] | 88 |
|
| 6 | could have had [art] | 88 |
|
| 7 | could have had a | 61 |
|
| 8 | could [vb infin] had a | 60 |
|
| 9 | could [verb] had a | 60 |
|
| 10 | could have had a | 60 |
|
| 11 | could have had a | 57 |
|
| 12 | could have have a | 57 |
|
