| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have been [verb] [adv] for several | 12 |
|
| 2 | have been [v-ing] [adv] for several | 10 |
|
| 3 | have been [adv] for several [noun] | 7 |
|
| 4 | have been [adv] for several [noun pl] | 7 |
|
