| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pers pn] could n't [prep] been | 7 |
|
| 2 | [pron] could n't [prep] been | 7 |
|
| 3 | it could n't [prep] been | 6 |
|
| 4 | it could n't [prep] been | 6 |
|
