| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be often a | 459 |
|
| 2 | [be] often a | 394 |
|
| 3 | [is] often a | 355 |
|
| 4 | is often a | 340 |
|
| 5 | [be] often an | 65 |
|
| 6 | [was/were] often a | 63 |
|
| 7 | was often a | 57 |
|
| 8 | are often a | 41 |
|
| 9 | [am/are] often a | 41 |
|
| 10 | 's often a | 15 |
|
| 11 | were often a | 6 |
|
