| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is what [verb] in | 32 |
|
| 2 | is what happen in | 26 |
|
| 3 | is what [vb -s] in | 17 |
|
| 4 | is what [vb past] in | 15 |
|
| 5 | is what happened in | 13 |
|
| 6 | is what happens in | 13 |
|
