| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is [adv] [verb] [conj] | 1409 |
|
| 2 | it is often [verb] [conj] | 163 |
|
| 3 | it is [adv] often [verb] | 32 |
|
| 4 | is [adv] often [verb] [conj] | 23 |
|
