| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it be [adv] often that | 21 |
|
| 2 | it [be] not often that | 20 |
|
| 3 | it [be] [not/n't] often that | 20 |
|
| 4 | it [is] [adv] often that | 18 |
|
| 5 | it is [adv] often that | 15 |
|
| 6 | it [be] not often that | 15 |
|
| 7 | it [be] n't often that | 5 |
|
