| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | every so often [to-vb] | 10 |
|
| 2 | [art] so often [to-vb] | 10 |
|
| 3 | [art] so often [to-vb] | 10 |
|
| 4 | every so often [to-vb] | 10 |
|
| 5 | [verb] so often [to-vb] | 5 |
|
| 6 | so often [verb] [to-vb] | 13 |
|
| 7 | so often seem [to-vb] | 5 |
|
| 8 | so often [vb base] [to-vb] | 5 |
|
