| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | had [not/n't] realised how | 23 |
|
| 2 | have [not/n't] realised how | 23 |
|
| 3 | have n't realised how | 13 |
|
| 4 | have not realised how | 10 |
|
