| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [subord] he could [adv] [verb] [Wh adv] | 8 |
|
| 2 | [subord] he could [not/n't] [verb] [Wh adv] | 7 |
|
| 3 | [subord] he could not [verb] [Wh adv] | 7 |
|
| 4 | [subord] he could n't [verb] [Wh adv] | 5 |
|
