| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [adv] [verb] [prep] a | 329 |
|
| 2 | [modal v] only [verb] [prep] a | 129 |
|
| 3 | could only [verb] [prep] [art] | 79 |
|
| 4 | could only [verb] [prep] [art] | 79 |
|
| 5 | could only [verb] [prep] a | 27 |
|
