| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could be [verb] [prep] [v-ing] | 424 |
|
| 2 | be [verb] [prep] be [v-ing] | 161 |
|
| 3 | could be [verb] [prep] be | 152 |
|
| 4 | could [verb] [prep] be [v-ing] | 5 |
|
