| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb -s] happen be | 88 |
|
| 2 | [vb -s] happen [is] | 87 |
|
| 3 | [vb -s] happen is | 86 |
|
| 4 | [vb -s] happened [be] | 64 |
|
| 5 | has happen [be] | 41 |
|
| 6 | 's happen [be] | 25 |
|
| 7 | [vb -s] to happen [be] | 22 |
|
| 8 | tends happen [be] | 14 |
|
