| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb mod] [verb] [be] [art] | 3408 |
|
| 2 | [modal v] [verb] [be] [art] | 3408 |
|
| 3 | could [verb] [be] [art] | 475 |
|
| 4 | could [verb] [be] [art] | 475 |
|
