| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [is] often [verb] | 386 |
|
| 2 | it [is] [adv] refer | 36 |
|
| 3 | it [is] [adv] refer | 36 |
|
| 4 | [pron] [is] often refer | 16 |
|
| 5 | it [be] often refer | 11 |
|
| 6 | it [is] often refer | 7 |
|
