| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [adv] be [vb pp] [prep] | 1303 |
|
| 2 | [adv] be [vb pp] [prep] [be] | 200 |
|
| 3 | could be [vb pp] [prep] [be] | 148 |
|
