| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | what [pron] [vb base] [be] [v-ing] | 250 |
|
| 2 | what [pron] [be] [v-ing] at | 237 |
|
| 3 | [pron] [vb base] [be] [v-ing] at | 109 |
|
