| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | what [is] [v-ing] [prep] the | 225 |
|
| 2 | [is] [v-ing] [to-vb] [prep] the | 205 |
|
| 3 | what [is] [v-ing] [to-vb] [prep] | 89 |
|
| 4 | what [is] [to-vb] [prep] the | 15 |
|
