| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | what is happening [prep] the economy | 5 |
|
| 2 | what is happening [prep] the economy | 5 |
|
| 3 | [Wh det] is happening [prep] the economy | 5 |
|
| 4 | [pron] is happening [prep] the economy | 5 |
|
