| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] [be] [verb] [to-vb] [det] | 644 |
|
| 2 | could [be] [verb] [to-vb] [adj] | 163 |
|
| 3 | could [be] [verb] [verb] [det] | 68 |
|
| 4 | could [be] [verb] [to-vb] [det] | 62 |
|
