| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | know when [to-vb] | 123 |
|
| 2 | [conj] when [to-vb] | 102 |
|
| 3 | [conj] know when | 24 |
|
| 4 | [conj] know [to-vb] | 6 |
|
