| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it could have been [pron] | 35 |
|
| 2 | it could have [be] [pron] | 35 |
|
| 3 | it could have be [pron] | 35 |
|
| 4 | it could have [been] [pron] | 35 |
|
| 5 | it could have [verb] [pron] | 27 |
|
| 6 | it could have [vb pp] [pron] | 26 |
|
