| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [det] could be [vb pp] [prep] | 402 |
|
| 2 | could be [vb pp] [prep] be | 166 |
|
| 3 | [det] could be [vb pp] be | 19 |
|
| 4 | [det] be [vb pp] [prep] be | 8 |
|
