| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] to happen [be] | 44 |
|
| 2 | [vb -s] to happen [be] | 22 |
|
| 3 | tends [to-vb] [be] | 18 |
|
| 4 | tends [verb] [be] | 18 |
|
| 5 | tend to happen [be] | 17 |
|
| 6 | tends happen [be] | 14 |
|
