| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [not/n't] [vb infin] these | 25 |
|
| 2 | could [not/n't] [verb] these | 25 |
|
| 3 | could not [verb] these | 17 |
|
| 4 | could n't [verb] these | 8 |
|
