| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | before [pron] could [verb] | 1078 |
|
| 2 | [conj] it could [verb] | 807 |
|
| 3 | before it [modal v] [verb] | 121 |
|
| 4 | before it [vb mod] [verb] | 121 |
|
| 5 | before it could [verb] | 39 |
|
