| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [be] not so obvious | 22 |
|
| 2 | be not so obvious | 22 |
|
| 3 | [is] not so obvious | 13 |
|
| 4 | is not so obvious | 10 |
|
| 5 | are not so obvious | 7 |
|
| 6 | [am/are] not so obvious | 7 |
|
| 7 | not [adv] so obvious | 6 |
|
| 8 | not [adv] so obvious | 6 |
|
| 9 | not so obvious [conj] | 7 |
|
