| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [vb mod] have happen [adj] [noun] | 6 |
|
| 2 | it [modal v] have happen [adj] [noun] | 6 |
|
| 3 | it have [adv] happen [adj] [noun] | 5 |
|
| 4 | it have happen [prep] [adj] [noun] | 14 |
|
| 5 | it have happen [prep] [adj] [noun] | 14 |
|
| 6 | it have happen in [adj] [noun] | 7 |
|
| 7 | it have happen in [adj] [noun] | 7 |
|
