| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [to-vb] [Wh det] be [v-ing] on | 177 |
|
| 2 | [adv] [Wh det] be [v-ing] on | 161 |
|
| 3 | [to-vb] [adv] [Wh det] be [v-ing] | 107 |
|
