| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] could have [be] | 1258 |
|
| 2 | [pers pn] could have [be] | 978 |
|
| 3 | i [modal v] have [be] | 689 |
|
| 4 | i could [verb] [be] | 178 |
|
| 5 | i could have [be] | 70 |
|
