| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | not so [adj] [to-vb] | 140 |
|
| 2 | not so [adj] [to-vb] | 86 |
|
| 3 | not [adv] difficult [to-vb] | 55 |
|
| 4 | [adv] so difficult [to-vb] | 12 |
|
| 5 | not so difficult [verb] | 5 |
|
| 6 | not so difficult [to-vb] | 5 |
|
| 7 | [not/n't] so difficult [to-vb] | 5 |
|
| 8 | not so difficult [to-vb] | 5 |
|
