| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | when did [pers pn] [vb infin] and | 7 |
|
| 2 | when did [pers pn] [vb infin] and | 7 |
|
| 3 | when did [pers pn] [vb infin] [coord] | 7 |
|
| 4 | when did you [vb infin] [conj] | 6 |
|
