| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | what have [been] [v-ing] to | 15 |
|
| 2 | what have been [v-ing] to | 15 |
|
| 3 | what have [been] happening to | 14 |
|
| 4 | what has [been] [v-ing] to | 7 |
|
| 5 | what 's [been] [v-ing] to | 7 |
|
