| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | had not [vb pp] about | 23 |
|
| 2 | had not [verb] about | 23 |
|
| 3 | had not known [prep] | 20 |
|
| 4 | had [adv] known about | 8 |
|
| 5 | had not known about | 6 |
|
| 6 | had [not/n't] known about | 6 |
|
| 7 | [vb past] not known about | 5 |
|
| 8 | have not known about | 5 |
|
| 9 | had not know about | 5 |
|
| 10 | [verb] not known about | 5 |
|
