| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it had never [vb pp] | 110 |
|
| 2 | it had never occurred | 34 |
|
| 3 | it had never occur | 34 |
|
| 4 | it had never happened | 20 |
|
| 5 | it had never happen | 20 |
|
| 6 | it had never existed | 9 |
|
| 7 | it had never exist | 9 |
|
