| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb base] he could [not/n't] [vb infin] | 11 |
|
| 2 | [vb base] he could [not/n't] [verb] | 11 |
|
| 3 | [vb base] he could n't [verb] | 9 |
|
