| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [adv] [verb] at the | 16 |
|
| 2 | could [adv] [vb infin] at the | 16 |
|
| 3 | could [adv] [verb] at the | 16 |
|
| 4 | could only [verb] at the | 9 |
|
