| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [det] [verb] | 1746 |
|
| 2 | it [det] [vb past] | 718 |
|
| 3 | it [det] happen | 101 |
|
| 4 | [pron] [det] happened | 73 |
|
| 5 | [pers pn] [det] happened | 68 |
|
| 6 | it [det] happened | 67 |
|
| 7 | it [adj] happened | 67 |
|
