| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is often [verb] | 1903 |
|
| 2 | is often [vb pp] | 1861 |
|
| 3 | is [adv] forgotten | 78 |
|
| 4 | is [adv] forgotten | 63 |
|
| 5 | be often forgotten | 22 |
|
| 6 | [be] often forgotten | 22 |
|
| 7 | [is] often forgotten | 20 |
|
| 8 | is often forget | 17 |
|
| 9 | is often forgotten | 17 |
|
