| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | why do [pron] [verb] [prep] | 262 |
|
| 2 | do [pron] [verb] back [prep] | 50 |
|
| 3 | why do [pron] [verb] back | 18 |
|
| 4 | why [pron] [verb] back [prep] | 9 |
|
