| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | by [Wh det] they [vb mod] [vb infin] | 21 |
|
| 2 | by which they [vb mod] [verb] | 18 |
|
| 3 | by [Wh det] they can [verb] | 8 |
|
| 4 | by [Wh det] they could [verb] | 5 |
|
