| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have been [adv] for several [noun] | 7 |
|
| 2 | [verb] been [adv] for several [noun] | 7 |
|
| 3 | been [verb] [adv] for several [noun] | 11 |
|
| 4 | been [v-ing] [adv] for several [noun] | 10 |
|
