| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb base] [pron] could have be [verb] | 11 |
|
| 2 | [vb base] [pron] could have been [verb] | 11 |
|
| 3 | [vb base] [pron] could have [been] [verb] | 11 |
|
| 4 | [vb base] [pron] could have [be] [verb] | 10 |
|
| 5 | [vb base] [pron] could have [be] [vb pp] | 9 |
|
| 6 | [vb base] [pers pn] could have [be] [verb] | 9 |
|
