| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | why did you [vb infin] back | 10 |
|
| 2 | why do you [vb infin] back | 10 |
|
| 3 | why [vb past] you [vb infin] back | 10 |
|
| 4 | why [verb] you [vb infin] back | 10 |
|
| 5 | why [verb] you come back | 7 |
|
