| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | what be [v-ing] the | 51 |
|
| 2 | what [is] [v-ing] the | 33 |
|
| 3 | what [be] causing the | 18 |
|
| 4 | what [was/were] [v-ing] the | 18 |
|
| 5 | what was [v-ing] the | 17 |
|
| 6 | what 's [v-ing] the | 17 |
|
| 7 | what is [v-ing] the | 16 |
|
