| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | which [modal v] [adv] | 5452 |
|
| 2 | [modal v] [adv] happen | 703 |
|
| 3 | which [adv] happen | 43 |
|
| 4 | which [modal v] happen | 43 |
|
