| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [subord] it is [adv] [vb pp] | 815 |
|
| 2 | [subord] it is often [vb pp] | 39 |
|
| 3 | it is [adv] often [vb pp] | 38 |
|
| 4 | [subord] it is [adv] often | 9 |
|
| 5 | [subord] is [adv] often [vb pp] | 7 |
|
