| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb mod] have been talking | 15 |
|
| 2 | [vb mod] [vb infin] been talking | 15 |
|
| 3 | [vb mod] have been talking | 13 |
|
| 4 | could [verb] been talking | 6 |
|
