| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [be] [adv] often [vb pp] [conj] | 8 |
|
| 2 | it be [adv] often [verb] [conj] | 8 |
|
| 3 | it [is] [adv] often [verb] [conj] | 7 |
|
| 4 | it is [adv] often [verb] [conj] | 7 |
|
