| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | what [is] happen [adv] | 169 |
|
| 2 | [v-ing] what [is] [adv] | 48 |
|
| 3 | [v-ing] what [is] happen | 24 |
|
| 4 | [v-ing] what happen [adv] | 5 |
|
