| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could only be [verb] [prep] | 359 |
|
| 2 | could [adv] be [verb] to | 237 |
|
| 3 | [modal v] only be [verb] to | 97 |
|
| 4 | could only [be] [verb] to | 11 |
|
