| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [pron] could [adv] [vb infin] | 100 |
|
| 2 | [prep] [pron] [modal v] only [vb infin] | 27 |
|
| 3 | [prep] [pron] could only [vb infin] | 6 |
|
| 4 | [prep] [pron] could only [verb] | 6 |
|
