| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] it happened | 21 |
|
| 2 | have it happened | 21 |
|
| 3 | had it happened | 13 |
|
| 4 | [vb past] it happened | 13 |
|
| 5 | [vb -s] it happened | 8 |
|
| 6 | has it happened | 8 |
|
| 7 | it have happened | 321 |
|
| 8 | it [verb] happened | 321 |
|
| 9 | it [vb past] happened | 157 |
|
| 10 | it had happened | 155 |
|
| 11 | it [vb -s] happened | 154 |
|
| 12 | it 's happened | 88 |
|
| 13 | it has happened | 66 |
|
| 14 | it [vb infin] happened | 8 |
|
| 15 | it have happened | 8 |
|
