| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | they could [verb] [noun] | 293 |
|
| 2 | they [modal v] have [noun] | 187 |
|
| 3 | [pron] could have [noun] | 107 |
|
| 4 | [pers pn] could have [noun] | 105 |
|
| 5 | they could have [noun] | 11 |
|
