| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | when do they | 38 |
|
| 2 | when [vb past] they | 28 |
|
| 3 | when did they | 27 |
|
| 4 | when [vb base] they | 13 |
|
| 5 | when do they | 11 |
|
