| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | explain [Wh adv] it is that | 20 |
|
| 2 | explain why it is that | 10 |
|
| 3 | explain how it is that | 10 |
|
| 4 | explain why it is that | 10 |
|
| 5 | explain how it is that | 10 |
|
| 6 | to explain [adv] it is that | 9 |
|
