| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could have [be] talking | 6 |
|
| 2 | could [verb] [be] talking | 6 |
|
| 3 | could [verb] [been] talking | 6 |
|
| 4 | could [vb infin] [be] talking | 6 |
|
| 5 | could [verb] been talking | 6 |
|
| 6 | could [verb] be talking | 6 |
|
| 7 | could have [be] talking | 5 |
|
