| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [conj] [be] [verb] [prep] a | 1526 |
|
| 2 | could [be] [verb] [prep] a | 971 |
|
| 3 | [conj] could [be] [verb] [prep] | 550 |
|
| 4 | [conj] could [verb] [prep] a | 48 |
|
| 5 | [conj] could [be] [verb] a | 6 |
|
