| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is often [adv] [vb pp] | 11 |
|
| 2 | it is often [adv] [verb] | 11 |
|
| 3 | it is often [not/n't] [verb] | 6 |
|
| 4 | it is often not [verb] | 6 |
|
| 5 | it is often not [verb] | 6 |
|
| 6 | it is often [adv] [verb] | 5 |
|
