| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | had not [vb pp] of | 175 |
|
| 2 | had not thought of | 107 |
|
| 3 | had n't [vb pp] of | 107 |
|
| 4 | had not [vb pp] of | 68 |
|
| 5 | had not heard of | 47 |
|
| 6 | had not known of | 10 |
|
