| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [verb] long been recognised | 16 |
|
| 2 | it [verb] long been recognised | 16 |
|
| 3 | it have long been recognised | 16 |
|
| 4 | it [vb -s] long been recognised | 15 |
|
| 5 | it has long been recognised | 15 |
|
