| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] to know [prep] | 23 |
|
| 2 | [vb mod] to know [prep] | 23 |
|
| 3 | ought to know [prep] | 19 |
|
| 4 | ought to know [prep] | 19 |
|
| 5 | [modal v] to know about | 12 |
|
| 6 | [modal v] to know about | 12 |
|
