| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] [be] [vb pp] [prep] [art] | 29463 |
|
| 2 | could [be] [verb] [prep] [art] | 2810 |
|
| 3 | could [be] [vb pp] [prep] [art] | 2751 |
|
