| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | usually happen [is] [conj] | 5 |
|
| 2 | usually happen is [conj] | 5 |
|
| 3 | usually happen [be] [conj] | 5 |
|
| 4 | usually happen be [conj] | 5 |
|
| 5 | usually happen [conj] [art] | 6 |
|
| 6 | usually happen [conj] [art] | 6 |
|
