| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [vb pp] could be | 31 |
|
| 2 | [was/were] [vb pp] could be | 11 |
|
| 3 | [be] [vb pp] could be | 11 |
|
| 4 | be [vb pp] could be | 11 |
|
| 5 | was [vb pp] could be | 8 |
|
| 6 | [is] [vb pp] could be | 5 |
|
