| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] [be] [prep] [v-ing] | 537 |
|
| 2 | [vb mod] [be] [prep] [v-ing] | 537 |
|
| 3 | could [be] [prep] [verb] | 18 |
|
| 4 | could [be] [prep] [v-ing] | 17 |
|
| 5 | could [be] [prep] [v-ing] | 17 |
|
| 6 | could [be] [prep] [v-ing] | 17 |
|
