| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is [verb] [verb] | 1460 |
|
| 2 | it is often [verb] | 364 |
|
| 3 | is often [verb] [verb] | 119 |
|
| 4 | it often [verb] [verb] | 15 |
|
