| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | which have never [been] [vb pp] | 16 |
|
| 2 | which have never [be] [vb pp] | 16 |
|
| 3 | which have never be [vb pp] | 16 |
|
| 4 | which have never been [vb pp] | 16 |
|
