| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb past] been [v-ing] for [num] hour | 10 |
|
| 2 | [vb past] be [v-ing] for [num] hours | 10 |
|
| 3 | had be [v-ing] for [num] hour | 7 |
|
