| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [verb] [prep] a | 1099 |
|
| 2 | only [verb] [prep] a | 499 |
|
| 3 | could only [verb] [prep] | 261 |
|
| 4 | could only [verb] a | 74 |
|
