| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is [not/n't] [vb pp] | 6108 |
|
| 2 | is often [vb pp] | 1861 |
|
| 3 | [not/n't] often [vb pp] | 102 |
|
| 4 | is [not/n't] often | 78 |
|
