| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is not [adj] for | 350 |
|
| 2 | it be not unknown for | 53 |
|
| 3 | it [be] not unknown for | 53 |
|
| 4 | it [is] not unknown for | 38 |
|
| 5 | it is [adv] unknown for | 37 |
|
| 6 | it is not unknown for | 35 |
|
| 7 | it is not unknown [prep] | 35 |
|
| 8 | it is not unknown for | 35 |
|
| 9 | [pers pn] is not unknown for | 35 |
|
| 10 | it is [not/n't] unknown for | 35 |
|
| 11 | [pron] is not unknown for | 35 |
|
