| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | if [indef pn] [verb] [adv] happen | 10 |
|
| 2 | if [indef pn] [vb -s] [adv] happen | 6 |
|
| 3 | if [indef pn] have [adv] happen | 6 |
|
