| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [to-vb] what it is that | 20 |
|
| 2 | [vb infin] what it is that | 7 |
|
| 3 | [v-ing] what it is that | 5 |
|
| 4 | know what it is that | 5 |
|
