| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could be [verb] [to-vb] | 1131 |
|
| 2 | could be [verb] to | 892 |
|
| 3 | be [verb] [to-vb] to | 357 |
|
| 4 | could [verb] [to-vb] to | 18 |
|
