| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [det] could [be] [vb pp] [prep] | 402 |
|
| 2 | [adv] could [be] [vb pp] [prep] | 73 |
|
| 3 | [adv] [det] could [be] [vb pp] | 56 |
|
