| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] could have ask for | 6 |
|
| 2 | [pers pn] could have ask for | 5 |
|
| 3 | could not have ask for | 11 |
|
| 4 | could [not/n't] have ask for | 11 |
|
| 5 | could [adv] have ask for | 11 |
|
| 6 | could n't have ask for | 6 |
|
| 7 | could not have ask for | 5 |
|
