| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] been [v-ing] for an | 31 |
|
| 2 | have been [v-ing] for an | 31 |
|
| 3 | [vb past] been [v-ing] for an | 15 |
|
| 4 | had been [v-ing] for an | 12 |
|
| 5 | [vb -s] been [v-ing] for an | 10 |
|
| 6 | has been [v-ing] for an | 7 |
|
| 7 | [verb] been looking for an | 7 |
|
