| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [subord] it could have [been] | 30 |
|
| 2 | [subord] it could have been | 30 |
|
| 3 | as it could have [been] | 7 |
|
| 4 | although it could have [been] | 5 |
|
