| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could be [prep] | 912 |
|
| 2 | [modal v] be for | 833 |
|
| 3 | could [be] for | 38 |
|
| 4 | could be for | 38 |
|
| 5 | could [be] for | 38 |
|
