| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [adv] have been [prep] | 34 |
|
| 2 | [vb mod] [adv] have been for | 8 |
|
| 3 | [modal v] [adv] have been for | 8 |
|
| 4 | could [adv] have [be] for | 6 |
|
| 5 | could [adv] have [been] for | 6 |
|
| 6 | could [adv] [verb] been for | 6 |
|
| 7 | could [adv] have been for | 6 |
|
| 8 | could [adv] have be for | 6 |
|
