| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] [be] [verb] to [adj] | 1816 |
|
| 2 | could [be] [verb] [prep] [adj] | 1439 |
|
| 3 | could [be] [verb] [prep] [adj] | 1439 |
|
| 4 | could [be] [verb] to [adj] | 176 |
|
