| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] has been [v-ing] for a | 16 |
|
| 2 | [noun sg] [vb -s] been [v-ing] for a | 11 |
|
| 3 | [noun prp] [vb -s] been [v-ing] for a | 8 |
|
