| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [adv] be [vb pp] at | 49 |
|
| 2 | [adv] be [vb pp] at a | 36 |
|
| 3 | could [adv] be [vb pp] a | 34 |
|
| 4 | could be [vb pp] at a | 24 |
|
