| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is [vb pp] [conj] [art] | 1419 |
|
| 2 | it is often [vb pp] [conj] | 163 |
|
| 3 | is often [vb pp] [conj] [art] | 62 |
|
| 4 | it is often [vb pp] [art] | 8 |
|
