| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [pron] [pron] [be] [v-ing] [prep] | 437 |
|
| 2 | [prep] [Wh det] [pron] [be] [v-ing] [prep] | 328 |
|
| 3 | [prep] what [pron] [be] [verb] [prep] | 320 |
|
| 4 | [prep] what [pron] [be] [v-ing] [prep] | 275 |
|
