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