| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | they could have [verb] [pron] [art] | 8 |
|
| 2 | they could have [vb pp] [pron] [art] | 8 |
|
| 3 | they could have [verb] [pron] [art] | 7 |
|
| 4 | they could have [verb] [pron] [art] | 7 |
|
| 5 | they could have [verb] [pers pn] [art] | 6 |
|
| 6 | they could have [verb] [pron] a | 5 |
|
