| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could have be [v-ing] | 93 |
|
| 2 | could have [been] [v-ing] | 93 |
|
| 3 | could have been [v-ing] | 93 |
|
| 4 | could have [be] [v-ing] | 88 |
|
| 5 | could have [be] talking | 6 |
|
| 6 | could have [be] going | 5 |
|
| 7 | could have [be] doing | 5 |
|
| 8 | could 've [be] [v-ing] | 5 |
|
| 9 | could have [be] looking | 5 |
|
