| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [Wh pn] have been [v-ing] for | 84 |
|
| 2 | [indef pn] [Wh pn] have been [v-ing] | 35 |
|
| 3 | [indef pn] have been [v-ing] for | 14 |
|
