| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] have been [adv] for | 22 |
|
| 2 | could have been [adv] [prep] | 15 |
|
| 3 | could have be [adv] for | 6 |
|
| 4 | could [verb] been [adv] for | 6 |
|
| 5 | could have [be] [adv] for | 6 |
|
| 6 | could have [been] [adv] for | 6 |
|
| 7 | could have been [adv] for | 6 |
|
