| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [not/n't] [vb infin] [to-vb] | 800 |
|
| 2 | [not/n't] [vb infin] [to-vb] at | 171 |
|
| 3 | could [not/n't] [vb infin] at | 138 |
|
| 4 | could [vb infin] [to-vb] at | 11 |
|
