| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it have happened | 321 |
|
| 2 | it had happen | 171 |
|
| 3 | it 's happen | 88 |
|
| 4 | it has happen | 69 |
|
| 5 | it have to happen | 20 |
|
| 6 | it have happen | 9 |
|
