| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | often [verb] | 17629 |
|
| 2 | often [vb -s] | 2088 |
|
| 3 | [adv] happens | 747 |
|
| 4 | [adv] happens | 747 |
|
| 5 | often happen | 168 |
|
| 6 | often happens | 127 |
|
