| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is [adv] known | 415 |
|
| 2 | it is often [verb] | 364 |
|
| 3 | it is often [vb pp] | 362 |
|
| 4 | it is [adv] known | 264 |
|
| 5 | [pron] is often known | 8 |
|
| 6 | it is often know | 6 |
|
| 7 | it is often known | 6 |
|
| 8 | it [is] often known | 6 |
|
| 9 | it [be] often known | 6 |
|
| 10 | it be often known | 6 |
|
