| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | had [verb] at | 1744 |
|
| 2 | had [vb pp] at | 1571 |
|
| 3 | had known [prep] | 176 |
|
| 4 | [verb] known at | 22 |
|
| 5 | have known at | 18 |
|
| 6 | [vb past] known at | 14 |
|
| 7 | had know at | 10 |
|
