| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [adv] [vb infin] [noun sg] at | 17 |
|
| 2 | could [adv] [verb] [noun sg] at | 9 |
|
| 3 | could not [verb] [noun sg] at | 8 |
|
| 4 | could [not/n't] [verb] [noun sg] at | 8 |
|
