| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] be [vb pp] to [be] | 1076 |
|
| 2 | could be [vb pp] [prep] [be] | 166 |
|
| 3 | could be [verb] to [be] | 153 |
|
| 4 | could [be] [vb pp] to [be] | 149 |
|
