| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb past] [be] [v-ing] | 7136 |
|
| 2 | [Wh pn] [be] [v-ing] | 7035 |
|
| 3 | [Wh pn] [vb past] [be] | 3471 |
|
| 4 | [Wh pn] [vb past] [v-ing] | 337 |
|
