| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [is] often [verb] [that] [subord] | 7 |
|
| 2 | it is often [verb] [that] [conj] | 7 |
|
| 3 | it [is] often [vb pp] [that] [conj] | 7 |
|
| 4 | it [is] often [verb] that [conj] | 7 |
|
