| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is [vb pp] [conj] | 11283 |
|
| 2 | is often [vb pp] | 1861 |
|
| 3 | often [vb pp] [conj] | 735 |
|
| 4 | is often [conj] | 21 |
|
