| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] why it [is] [verb] | 26 |
|
| 2 | be why it [is] [verb] | 21 |
|
| 3 | [be] why it [is] [verb] | 21 |
|
| 4 | [is] why it [is] [verb] | 20 |
|
| 5 | [vb infin] why it [is] [verb] | 13 |
|
| 6 | is why it [is] [verb] | 11 |
|
| 7 | 's why it [is] [verb] | 9 |
|
| 8 | [to-vb] why it [is] [verb] | 8 |
|
| 9 | know why it [is] [verb] | 7 |
|
| 10 | [coord] why it [is] [verb] | 6 |
|
| 11 | reason why it [is] [verb] | 6 |
|
| 12 | [noun] why it [is] [verb] | 6 |
|
| 13 | [conj] why it [is] [verb] | 6 |
|
| 14 | and why it [is] [verb] | 5 |
|
| 15 | and why it [is] [verb] | 5 |
|
| 16 | [noun sg] why it [is] [verb] | 5 |
|
| 17 | reason why it [is] [verb] | 5 |
|
| 18 | why it [is] [adj] [verb] | 69 |
|
| 19 | why it [is] [adj] [verb] | 59 |
|
| 20 | why it [is] important [verb] | 20 |
|
| 21 | why it [is] important [verb] | 20 |
|
| 22 | why it [is] necessary [verb] | 13 |
|
| 23 | why it [is] necessary [verb] | 13 |
|
| 24 | why it [is] [adv] [verb] | 12 |
|
| 25 | why it [is] good [verb] | 7 |
|
| 26 | why it [is] [not/n't] [verb] | 6 |
|
| 27 | why it [is] not [verb] | 6 |
|
| 28 | why it [is] [adv] [verb] | 6 |
|
| 29 | why it [is] [pron] [verb] | 5 |
|
| 30 | why it [is] [be] [verb] | 5 |
|
