| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [adv] have been [verb] for | 15 |
|
| 2 | could [adv] have been [vb pp] for | 15 |
|
| 3 | could [adv] have been [adj] for | 10 |
|
| 4 | could [adv] have been [adj] for | 7 |
|
