| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could be [vb pp] [prep] | 7113 |
|
| 2 | [det] could be [vb pp] | 740 |
|
| 3 | [det] be [vb pp] [prep] | 245 |
|
| 4 | [det] could be [prep] | 41 |
|
