| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] why it is that | 27 |
|
| 2 | [to-vb] why it is that | 12 |
|
| 3 | explain why it is that | 10 |
|
| 4 | [vb base] why it is that | 6 |
|
| 5 | to explain why it is that | 5 |
|
| 6 | [vb infin] why it is that | 5 |
|
