| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb -s] not always happen | 9 |
|
| 2 | [vb -s] [not/n't] always happen | 9 |
|
| 3 | does [adv] always happen | 9 |
|
| 4 | [vb -s] not always happen | 7 |
|
