| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [adv] have [been] [art] [adj] | 14 |
|
| 2 | could [adv] have been [art] [adj] | 14 |
|
| 3 | could [adv] have [been] [art] [adj] | 14 |
|
| 4 | could [adv] have [been] a [adj] | 10 |
|
| 5 | could well have [been] [art] [adj] | 7 |
|
| 6 | could [adv] have [been] a [adj] | 6 |
|
