| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it have occurred to | 28 |
|
| 2 | it [verb] occurred to | 28 |
|
| 3 | it had occurred to | 21 |
|
| 4 | it [vb past] occurred to | 21 |
|
| 5 | it has occurred to | 6 |
|
| 6 | it [vb -s] occurred to | 6 |
|
