| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could be [vb pp] [verb] [adv] [conj] | 8 |
|
| 2 | could be [verb] [to-vb] [adv] [conj] | 7 |
|
| 3 | could be [verb] [verb] [adv] [coord] | 6 |
|
