| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it often [verb] that | 34 |
|
| 2 | it often [vb -s] that | 29 |
|
| 3 | it often happen that | 24 |
|
| 4 | it often happens that | 24 |
|
| 5 | it often [vb past] that | 5 |
|
| 6 | it often seem that | 5 |
|
