| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] is often [vb pp] | 923 |
|
| 2 | [noun] it is [vb pp] | 857 |
|
| 3 | it is often [vb pp] | 362 |
|
| 4 | [noun] it is often | 89 |
|
