| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] it have [verb] | 1195 |
|
| 2 | [adv] it have [vb pp] | 1145 |
|
| 3 | [adv] [pron] have happened | 223 |
|
| 4 | [adv] it have happen | 40 |
|
| 5 | [adv] it [verb] happened | 39 |
|
