| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [conj] it [is] [vb pp] | 5408 |
|
| 2 | it [is] often [vb pp] | 383 |
|
| 3 | [conj] it [is] often | 243 |
|
| 4 | [conj] [is] often [vb pp] | 142 |
|
