| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] could [be] [verb] [prep] | 1638 |
|
| 2 | [Wh det] could [be] [verb] [prep] | 593 |
|
| 3 | what [modal v] [be] [verb] [prep] | 560 |
|
| 4 | what could [be] [verb] [prep] | 85 |
|
