| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [conj] they could [vb infin] | 1608 |
|
| 2 | before [pron] could [vb infin] | 1078 |
|
| 3 | [subord] they could [vb infin] | 807 |
|
| 4 | before they [modal v] [vb infin] | 246 |
|
| 5 | before they could [vb infin] | 103 |
|
| 6 | before they could [verb] | 103 |
|
