| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is [adv] [vb pp] | 4713 |
|
| 2 | it is often [vb pp] | 362 |
|
| 3 | is often [adv] [vb pp] | 122 |
|
| 4 | it is often [adv] | 103 |
|
