| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb -s] happen [prep] the last [noun] | 5 |
|
| 2 | [vb -s] happened [prep] the last [noun] | 5 |
|
| 3 | [vb -s] happen [prep] the last [noun sg] | 5 |
|
| 4 | has happen [prep] the last [noun] | 5 |
|
