| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [be] [verb] [prep] [art] | 2810 |
|
| 2 | [modal v] [be] [v-ing] [prep] [art] | 1432 |
|
| 3 | could [be] [v-ing] [prep] [art] | 58 |
|
| 4 | could [be] [v-ing] [prep] [art] | 58 |
|
| 5 | could [be] [v-ing] [prep] [art] | 58 |
|
