| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could be [verb] [conj] [pron] [verb] | 60 |
|
| 2 | could be [verb] [conj] [pron] [vb past] | 38 |
|
| 3 | [modal v] be [verb] [conj] [pron] had | 38 |
|
| 4 | [vb mod] be [verb] [conj] [pron] had | 38 |
|
| 5 | could be [verb] [conj] [pron] have | 12 |
|
| 6 | could [be] [verb] [conj] [pron] had | 7 |
|
| 7 | could be [verb] [conj] [pron] had | 7 |
|
