| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | what had [adv] happen [prep] | 9 |
|
| 2 | what had [adv] happened [prep] | 9 |
|
| 3 | what had [adv] happen between | 6 |
|
| 4 | what had [adv] happen between | 6 |
|
