| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [verb] not happen | 28 |
|
| 2 | it do not happen | 28 |
|
| 3 | it [vb past] not happen | 20 |
|
| 4 | it did not happen | 20 |
|
| 5 | it [vb -s] not happen | 8 |
|
| 6 | it does not happen | 8 |
|
