| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is often [verb] | 364 |
|
| 2 | it is often [vb pp] | 362 |
|
| 3 | it is [adv] forgotten | 23 |
|
| 4 | it is [adv] forgotten | 19 |
|
| 5 | [pron] is often forgotten | 14 |
|
| 6 | it be often forgotten | 13 |
|
| 7 | it [be] often forgotten | 13 |
|
| 8 | it [is] often forgotten | 13 |
|
| 9 | it is often forget | 10 |
|
| 10 | it is often forgotten | 10 |
|
