| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | why [vb past] it [verb] | 74 |
|
| 2 | why [vb past] it [verb] | 74 |
|
| 3 | why [vb past] it [vb infin] | 66 |
|
| 4 | why did it [verb] | 66 |
|
| 5 | why [vb past] it have | 15 |
|
| 6 | why [vb past] it have | 14 |
|
| 7 | why [vb past] it happen | 11 |
|
| 8 | why [vb past] it happen | 9 |
|
| 9 | why had it [verb] | 8 |
|
| 10 | why [vb past] it take | 8 |
|
| 11 | why [vb past] it [vb pp] | 8 |
|
| 12 | why [vb past] it take | 7 |
|
