| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [to-vb] [Wh adv] it is that | 18 |
|
| 2 | [to-vb] why it is that | 12 |
|
| 3 | [to-vb] why it is that | 12 |
|
| 4 | to explain [adv] it is that | 9 |
|
| 5 | [to-vb] how it is that | 6 |
|
| 6 | [to-vb] how it is that | 6 |
|
