| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | what has [vb pp] [prep] [adj] [noun sg] | 6 |
|
| 2 | what has [verb] [prep] [adj] [noun sg] | 6 |
|
| 3 | what has happen [prep] [adj] [noun sg] | 5 |
|
| 4 | what has happened [prep] [adj] [noun sg] | 5 |
|
