| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could be [prep] | 912 |
|
| 2 | could be [prep] | 912 |
|
| 3 | [vb mod] be to | 431 |
|
| 4 | [modal v] be to | 431 |
|
| 5 | could be to | 18 |
|
| 6 | could [be] to | 18 |
|
| 7 | could be to | 18 |
|
