| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is often [vb pp] that | 150 |
|
| 2 | it is [vb pp] [adv] that | 70 |
|
| 3 | it is often [vb pp] [adv] | 22 |
|
| 4 | is often [vb pp] [adv] that | 8 |
|
