| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | a [noun sg] which happen | 14 |
|
| 2 | a [noun sg] [Wh det] happen | 11 |
|
| 3 | an [noun sg] [Wh det] happen | 10 |
|
| 4 | a [noun sg] [Wh det] happens | 10 |
|
| 5 | a [noun sg] [Wh det] happened | 10 |
|
| 6 | a [noun sg] what happen | 6 |
|
