| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could only [be] [verb] | 512 |
|
| 2 | could only [be] [vb pp] | 506 |
|
| 3 | [vb mod] only [be] used | 186 |
|
| 4 | [modal v] only [be] used | 186 |
|
| 5 | could [adv] [be] used | 174 |
|
| 6 | could only [be] used | 19 |
|
| 7 | could only [be] use | 19 |
|
| 8 | could only [be] used | 19 |
|
