| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] could [verb] them at | 8 |
|
| 2 | [pers pn] could [verb] them at | 7 |
|
| 3 | could [adv] [verb] them at | 9 |
|
| 4 | could not [verb] them at | 7 |
|
| 5 | could [not/n't] [verb] them at | 7 |
|
