| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] could not [prep] [been] | 8 |
|
| 2 | [pers pn] could not [prep] [been] | 8 |
|
| 3 | it could not [prep] [been] | 7 |
|
| 4 | it could not [prep] [been] | 7 |
|
