| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could be [verb] [prep] | 7290 |
|
| 2 | could be [vb pp] [prep] | 7114 |
|
| 3 | [modal v] be seen [prep] | 2424 |
|
| 4 | could be see [prep] | 249 |
|
| 5 | could [be] seen [prep] | 249 |
|
| 6 | could be seen [prep] | 249 |
|
