| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could be [verb] at a | 30 |
|
| 2 | could [be] [verb] at a | 30 |
|
| 3 | could [be] [vb pp] at a | 24 |
|
| 4 | could [be] [v-ing] at a | 6 |
|
| 5 | could [be] looking at a | 5 |
|
| 6 | could [be] look at a | 5 |
|
