| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | which have hitherto [vb pp] | 33 |
|
| 2 | which have hitherto [verb] | 33 |
|
| 3 | which had hitherto [verb] | 21 |
|
| 4 | which have hitherto [verb] | 6 |
|
| 5 | which has hitherto [verb] | 6 |
|
