| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] happen [be] [conj] | 37 |
|
| 2 | [adv] happen [be] [conj] | 35 |
|
| 3 | usually [verb] [be] [conj] | 10 |
|
| 4 | usually happen [be] [conj] | 5 |
|
