| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have been [v-ing] in a | 84 |
|
| 2 | who have been [v-ing] in | 68 |
|
| 3 | who have been [v-ing] a | 43 |
|
| 4 | who have been in a | 24 |
|
