| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | when did [pron] [verb] | 382 |
|
| 2 | did [pron] [verb] [noun sg] | 332 |
|
| 3 | when [pron] [verb] [noun sg] | 250 |
|
| 4 | when did [pron] [noun sg] | 8 |
|
