| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [be] not often a | 8 |
|
| 2 | be not often a | 8 |
|
| 3 | [is] not often a | 5 |
|
| 4 | not often [vb infin] a | 7 |
|
| 5 | not often [verb] a | 7 |
|
| 6 | not often a [noun] | 5 |
|
| 7 | not often a [noun sg] | 5 |
|
