| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb -s] been [v-ing] for a | 55 |
|
| 2 | [vb -s] been [v-ing] for a | 45 |
|
| 3 | has been [v-ing] for a | 37 |
|
| 4 | 's been [v-ing] for a | 18 |
|
| 5 | [vb -s] been [v-ing] for an | 10 |
|
| 6 | [vb -s] been looking for a | 7 |
|
| 7 | [vb -s] been waiting for a | 6 |
|
| 8 | [vb -s] been running for a | 6 |
|
