| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | but have never be | 25 |
|
| 2 | but have never been | 25 |
|
| 3 | but had never be | 11 |
|
| 4 | but has never be | 8 |
|
| 5 | but have never be | 6 |
|
