| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have n't heard | 370 |
|
| 2 | have [not/n't] heard | 274 |
|
| 3 | had [not/n't] heard | 209 |
|
| 4 | have not heard | 178 |
|
| 5 | has [not/n't] heard | 31 |
|
| 6 | 've [not/n't] heard | 30 |
|
