| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [Wh adv] [pron] be [v-ing] | 486 |
|
| 2 | [Wh adv] [pron] be [v-ing] for | 67 |
|
| 3 | [prep] [pron] be [v-ing] for | 27 |
|
