| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [adv] be | 7505 |
|
| 2 | could [adv] be | 4064 |
|
| 3 | [modal v] only be | 3856 |
|
| 4 | [vb mod] only be | 3856 |
|
| 5 | could only [be] | 706 |
|
| 6 | could only be | 706 |
|
| 7 | could only be | 706 |
|
