| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [not/n't] [vb infin] [verb] | 2608 |
|
| 2 | [not/n't] [vb infin] [verb] at | 310 |
|
| 3 | could [not/n't] [vb infin] at | 138 |
|
| 4 | could [not/n't] [verb] at | 138 |
|
| 5 | could [vb infin] [verb] at | 69 |
|
