| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could have be [v-ing] [prep] | 31 |
|
| 2 | [modal v] have be [v-ing] about | 22 |
|
| 3 | could have be [verb] about | 10 |
|
| 4 | could [verb] be [v-ing] about | 6 |
|
| 5 | could have [be] [v-ing] about | 6 |
|
