| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] could have [vb pp] a | 170 |
|
| 2 | [pers pn] could have [vb pp] a | 150 |
|
| 3 | they [vb mod] have [vb pp] a | 134 |
|
| 4 | they [modal v] have [vb pp] a | 134 |
|
| 5 | they could have [vb pp] [art] | 46 |
|
| 6 | they could have [vb pp] [art] | 46 |
|
| 7 | they could have [vb pp] a | 18 |
|
| 8 | they could [verb] [vb pp] a | 14 |
|
| 9 | they could [vb infin] [vb pp] a | 14 |
|
| 10 | they could have [vb pp] a | 14 |
|
| 11 | they could have [vb pp] a | 14 |
|
| 12 | they could have [verb] a | 12 |
|
| 13 | they could have [vb pp] a | 12 |
|
