| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [subord] it be often [verb] [conj] | 8 |
|
| 2 | [subord] it is often [verb] [conj] | 8 |
|
| 3 | [subord] it [is] often [verb] [conj] | 8 |
|
| 4 | [subord] it [be] often [verb] [conj] | 8 |
|
